Baked Oatmeal Squares Recipe

In this adaption of a classic Baked Oatmeal Squares Recipe from AndreAnna at Life As A Plate, oats are soaked overnight to reduce phytic acid and increase the nutrient availability. Thanks, AndreAnna!

I developed this Baked Oatmeal Squares recipe a few years ago to be able to make versatile breakfasts for myself and my husband when we both worked in an office. It makes a lot of servings and I’d make this batch on a Sunday and it would feed us both all week. I’d cut off a square, stick it in a Tupperware bowl and with a 20 second stint in the microwave would have a healthy breakfast. Except back then I used quick oats and no soaking. Recently, as I’ve grown and learned and researched my way into the Real Food World, I’ve learned the benefits of using whole steel cut oats as well as why it’s so important to soak them.

From Sally Fallon in Nourishing Traditions:

All grains contain phytic acid (an organic acid in which phosphorous is bound) in the outer layer or bran. Untreated phytic acid can combine with calcium, magnesium, copper, iron especially zinc in the intestinal track and block their absorption. This is why a diet high in unfermented whole grains may led to serious mineral deficiencies and bone loss. The modern misguided practice of consuming large amounts of unprocessed bran often improves colon transit time at first but may lead to irritable bowel syndrome and, in the long term, many other adverse effects. Soaking allows enzyme, lactobacilli and other helpful organisms to break down and neutralize phytic acid. As little as seven hours of soaking in warm acidulated water will neutralize a large portion of phytic acid in grains. The simple practice of soaking cracked or rolled cereal grains overnight will vastly improve their nutritional benefits.

So this recipe for baked oatmeal calls for you soaking your steel cut oats for 24 hours following her method. For each cup of oats, I use 1 cup of warm water and 2 tbsp of whey (I have a lot leftover from making my raw milk yogurt so this was perfect). You can also use buttermilk or yogurt.

I also bake this slow at a low temperature for an hour and it lets the oats soak up the milk and cook slowly. I used raw milk, cinnamon, and raisins but the possibilities really are endless: you could use almond milk and cranberries, coconut milk and dried mangos, etc. You could add sliced nuts, fresh fruit, or – gasp – whipped fresh cram – when it’s done, hot and piping out of the oven.

Baked Oatmeal Squares Recipe

The Players:

The How-To:
1) Pour the oats in a large bowl and pour in the warm water and whey. Stir gently, cover, and let sit for 24 hours.
2) After 24 hours, pour off the soaking water.
3) Add in the 4 c. raw milk, beat egg, and the other ingredients you’re using: in this case, the vanilla, cinnamon, stevia, and raisins.
4) Pour into 13X9 baking dish. It WILL not be a batter and will be liquid. Don’t worry; it’ll cook up in the oven.
5) Bake on 325 for 45-60 minutes until firm.
6) Cut into squares and serve with your choice of toppings.

Enjoy your baked oatmeal squares!


  1. says

    I was just wondering where you get GF steel cut oats. I’ve looked for them but haven’t found them. I’ve seen on line that Bob’s Red Mill makes them, but I haven’t seen them. Is that the brand you use?

    The recipe looks good! And if I leave out the raisins I can have it on my fructose friendly diet. (I also have fructose intolerance.)


    • says

      Yeah, we used Bob’s Red Mill certified GF oats. I find it in my local health section of my supermarket (HyVee). You should also be able to find them at Wegmans or Whole Foods or any health food store.

  2. says

    That looks so good! I’ve been needing a break from eggs and bacon or smoothies every morning. Can’t wait to try this!

    When substituting yogurt, am I just using the 2 TBSP or is it a cup of yogurt?

  3. says

    This sounds great! I usually just stick my oats in a jar with raw milk yogurt overnight, and then throw in some peanut butter and/or raisins and/or fresh fruit in the morning. This sounds like a GREAT alternative!

  4. Jennifer says

    Wow this looks amazing. I also have just recently learned about soaking rolled oats from food renegade and have noticed a significant difference. I soak my oats w/ water & kefir in the refrigerator over night, should I be storing this on the kitchen counter instead? And what other grains should I be soaking? Thanks again for the recipe.

  5. Valerie Mints via Facebook says

    I hope to make this for church snack next week – now to get a decent source of buttermilk.

  6. Esther says

    If using regular, old fashioned oats, would you want to decrease the amount of milk? Thanks for the wonderful recipe!

    • says

      Yes, Esther, definitely. Steel cut oats soak up way more liquid. I don’t know the exact ratio though as we don’t eat rolled oats but I would surmise it would be around 1/2. You could always test out a small batch and report back!

      • says

        I checked back in my old recipe index for when I did use the quick oats and these were the ingredients: Hope this helps!

        3 c oatmeal
        1 t cinnamon
        ½ t nutmeg
        2 t baking powder
        ¼ c brown sugar
        ½ c applesauce
        ½ c vanilla yogurt
        2 eggs (or the equivalent)
        1 ½ c lowfat milk
        Dash of vanilla

          • Mikela says

            Is there a reason you don’t use lowfat milk anymore? and other then being GF, do you consider rolled oats to be less nutritional? Its just that a lot more recipes call for them then steel cut oats and I have steal cut oats but I never cooked with them before.

            • KristenM says

              Low-fat milk is unnatural and highly processed. Vitamins A & D are fat-soluble vitamins, so they need to be taken in with the fat naturally present in whole milk in order to be assimilated by the body. Furthermore, our bodies need fat (particularly if we’re women; we need fat to make all those wonderful hormones!).

              I don’t thin rolled oats are any less nutritious than steel cut oats. I just like the texture of steel cut oats better.

  7. Tammy says

    These sound great but how would I serve them later if I don’t have a microwave? I got rid of it years ago :) Just curious if they are any good not heated back up?

      • says

        My mother was eating her cold the other day, ha! I personally have no issue with the microwave but for those that do, you can use a toaster oven for this. I’d just put it in an oven-safe dish with maybe a little extra splash of milk to prevent it from drying out.

  8. says

    Just curious…do you still use a microwave? Hah. Just thought it seemed funny that a food renegade such as yourself would use one. Of course I know the jury is still out on whether it is really bad for you. I went ahead and gave mine up a while back but my husband still wishes we had it. Thanks for the recipe. We love oatmeal here at my house but with five little ones I am desperate for a quick alternative to processed cereals.

    • KristenM says

      I do have a microwave, but I rarely, if ever use it. I went for more than a year without one when when I lived at my last place, but when I moved this past January I got one since this house has one built in.

      As a rule, I don’t use the microwave to cook food. But I allow my boys to reheat their own food with it because it is so much safer than a stove and well within their capabilities. My oldest child (6 years) is *almost* mature enough to learn how to use the stove to cook some of his favorite easy meals, but not quite. I think he could do it without hurting himself, but I’d be afraid that he’d leave the burner on! So, for now, he’s got permission to microwave his food for 30 seconds to a minute so that he can prepare his hot snacks himself.

  9. says

    Very delicious! I halved the batch and used maple syrup as the sweetener. I had to bake it for more than an hour and it was still quite soft, but so good! We topped it with butter and raw cream.

  10. HollymMead says

    I am wondering what I have done wrong. I followed the recipe (and have checked and rechecked and re-re-checked just to be sure) and after two and a half hours, they are STILL in the oven and are still near-liquid (about the consistency of a bowl of milky oatmeal, not like a baked good and I certainly couldn’t cut anything yet). Everything smells yummy, but we still are not at a breakfast square stage.

    The only thing that seems “amiss” is that I had no liquid to pour off after the soaking process. I even dumped the oats in a colander to drain them.

    Any suggestions?

    • Olivia says

      Yes, I was wondering the same thing. I made this recipe this morning after soaking it last night before bed. I put it in the oven at 8 this morning and it is now almost 10:30 and it is nowhere near “baked”, still just milky oatmeal. I even increased the oven temperature to 350 for the last hour. Any clues as to what I have done wrong?? Like Holly, the only thing that seems to be “amiss” is that there was no water to pour off this morning. If anyone has any ideas, please let me know because this recipe looks so good!

      • says

        Are the 4 cups of milk too much? For anyone this worked for, how much milk did you use. My oats are currently soaking but I want to make sure I end up with oatmeal breakfast bars, not milky oatmeal. I’ll drain in a sieve to make sure all the extra water is gone but does anyone have other suggestions?

        • Brenill says

          Are you sure you’re using Steel Cut oats and not regular? As mentioned in an earlier post, regular oats will not soak up as much liquid.

          • mary says

            I tried it earlier in the week and used the wrong oats (it came out like bread pudding sort of. kids still liked it…)

            But I retried today and it was really, really gooey again. I used the steel cut oats.

            I just looked around the internet: everybody else makes theirs with half the milk this recipe calls for.

            Expensive recipe to be so off! I love this site but maybe you could update the recipe?

            • mary says

              After I commented I had to feed my daughter something, so gave her some of the gooey oats. I then stirred it– the liquid congealed on teh top, the oats on the bottom — and rebaked. I think maybe now they’ll be sqares? Do you have some stirring step after, say, twenty or thirty mintues?

            • KristenM says

              Hi Mary,

              What happens when you drain the soaking water off?

              I’ve never had this recipe fail me, so I’m curious as to whether or not it has to do with the original moisture content of the steel cut oats. It seems like a few people have commented that their oats completely soaked up the water/whey the night before, without having any leftover to drain off, and that those same people are the ones who had difficulty getting their recipe to bake up nicely.

              • mary says

                I had a lot of water to drain off today. Stirring did make a difference — they turned to squares. Gooey squares–that’s how they’re supposed to be though, right? I’m not sure why my oats fall to the bottom and don’t mix (it was like pudding on top, oats on bottom).

  11. DebbieSNH says

    This looks absolutely fabulous, I have all the ingredients, and I approve the ingredients! Yeah. Will try it soon! Thanks – D

  12. says

    I used to make a version of this into a cookie and give it to the children I nannied for. They never knew the difference and loved that they got “cookies” sometimes for breakfast. : )

  13. chan says

    Has anyone considered using a crushed banana to sweeten? in lieu of honey or stevia…. That is what I do when I make stovetop almond butter oatmeal, and it is delish!! The kiddies ask for seconds and thirds :-)). I’ll try these squares with the banana.

  14. Beth says

    Does anyone know of an alternative to whey/buttermilk/yogurt? Would natural apple cider vinegar (with the mother in it) work? Or even some acidophilus capsules opened up. We have dairy allergies. :) Thanks!

  15. Bethany says

    Beth, I have an allergy to dairy as well. I have not made this recipe yet, but I’m going to use yogurt made with coconut milk. I love it. You can get it at Whole Foods.

  16. Laura Williams says

    I really love the site and am soaking some steel-cuts oats this very minute to try this recipe! (My opinion of Sally Fallon as any scientific expert, however, is diminished if she really refers in her book to the intestinal “track.”)

    • Michelle says

      That was a typo on this website. Her book says, “intestinal tract.” The missing “and” in “copper, iron and especially zinc” was also a typo only on this website, not in her book.

  17. Kara R. says

    Can you leave this sit on the counter overnight even if using store-bought refrigerated buttermilk? I only have access to organic store-bought buttermilk that says “keep refrigerated”…am tempted to leave on my counter for 24 hours but worries about the buttermilk spoiling! Is the “leave on the counter” method only for raw milk or whey? Thank you!


  18. Susie says

    I made my batch two days ago. It tastes great! However, the top came out crunchy like a granola bar (which I love!), but the bottom came out mushy and it was like the milk and most of the oats went to the bottom. Is there a way to fix this? I also was wondering about what Kara R. wrote. Do we have to keep it refrigerated? I used raw milk.

  19. says

    We really like your Baked Oatmeal Squares, I just add a little raw cacoa powder and extra honey. Hope you don’t mind but I linked to this recipe for my Winter Picnic post.

  20. Gavin says

    I noticed you used leftover whey from yogurt to soak your oats. I have leftover whey from making cheese. Would this be okay to use? Does it make a difference?

    • Jennifer S. says

      I have read in a few places that it is necessary to add 1T of whole wheat flour per 1 cup of oats when soaking to help break down the phytic acid. Perhaps this would also help thicken it up for those ending up with a runny concoction. I am just about to follow the recipe myself, adding the whole wheat flour and chopping up an apple or two instead of raisins. I hope mine turns out as yummy as yours look!

  21. Michelle says

    Doesn’t make sense to me to use raw milk and raw honey if I’m just going to cook it anyway. Has anyone tried using water instead of milk or putting the honey on top after cooking? Or other “milks” (coconut, almond, etc.) or cream. Thanks for any comments.

  22. Tasha says

    I made this today, and it was delicious. I forgot to drain off the whey, since it looked like all the liquid had been drained off until I poured it into the pan. It still tasted good! It did separate. The oats sank to the bottom and the custard rose to the too. I blame it on not draining. Also, I used some rolled oats, since I underestimated the amount of steel cut that I had on hand. Way too much liquid, but it was my fault for following the directions well.
    I will make this again!

  23. Tara says

    I’m quite stunned that you would be concerned about nutrient absorption and then use a microwave? Any food you put in there becomes void of any nutrition. Thoughts ?

  24. says

    Do I need to soak my oats if I have sprouted oats? Can I skip the overnight soak and simply use dry sprouted oats, since sprouting and soaking are designed to accomplish the same task?

  25. Amy says

    Recipe sounds really good and a time saver, but I am in agreement with the previous comments regarding the microwave and also am wondering if you still use the tupperware for reheating the Oatmeal Squares,or if this was just a part of the original recipe and you now have switched out the plastic for something better healthwise?

  26. Christina Warrington says

    Hi, I thoroughly enjoy your weekly posts. Thanks for sharing all your knowledge. I made the squares, but wanting some clarity as mine were still watery after 50 min so I cooked I until it was absorbed. I soaked as directed but when I went to pour off liquid, it was most difficult to separate form the oats. So I reduced the almond milk 1/4 cup. I have to admit to that I only soaked them 16 hrs. Could that have been part of the issue, I wouldn’t have been able to cook them till 29 hrs so I took the early time. The taste is good, & the steel cut oats have a bitey / chewy texture as when I boil them for oatmeal. I also just read a post about not combining dairy & fruit. I love yogurt & fruit together. Is it a problem for digestion? Sorry for the long questions. Thanks again for sharing.
    Christina Warrington

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