Baked Blueberry Oatmeal

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blueberry oatmeal in a white baking dish

Baked oatmeal takes just a few minutes to prepare and then the oven does the rest of the work. It’s great for make-ahead / meal prep breakfasts or for serving a crowd.

If you’ve never made baked oatmeal before, let me tell you the real reason to make it. It’s not because it’s simple or convenient or great for meal prep or great for a crowd (though it is all of those things). The real reason to make baked oatmeal because it will make your entire kitchen smell like it has been wrapped up in a cozy, warm, cinnamon-laced blanket. Which is exactly what we need this time of year.

I hadn’t made baked oatmeal in a few years, but I returned to my go-to recipe again this year because we are all still home on weekday mornings. My first graders are still taking their classes online and my husband and I are still working out of the house. It means many moments feel crazy, but our mornings feel more relaxed than they did when we had to get everyone out the door by 8am. And since I figured others might be in a similar boat, this delicious oatmeal method felt worth revisiting. 

Baked oatmeal does require some time in the oven (about 35 minutes), but it only takes 10 minutes of prep to get everything ready for baking. The leftovers can be easily sliced into individual portions and then breakfast is ready for the whole week. Or if you just don’t have that much time in the morning but still want to get your oats fix, check out my make-ahead Mason Jar Overnight Oats that you can just grab out of the fridge as you run out of the door in the morning.

ingredients for blueberry oatmeal in a white bowl

Ingredients

  • Milk – Use any type of milk. I use cow’s milk or almond milk, depending on what we have. I’ve also used apple juice in the past which adds enough sweetness that you can easily reduce (or omit) the added sugar.
  • Oats – Be sure to use “Rolled Oats” or “Old-Fashioned Oats”. Instant or Quick-Cook Oats won’t work properly in this recipe. 
  • Baking Powder – The baking powder helps the baked oatmeal to puff slightly as it bakes, giving it a lighter texture and creating slices that can be cut into individual portions. 
  • Brown Sugar, Pure Vanilla Extract, Cinnamon, Eggs – Just regular baking / fridge staples. The eggs help the oatmeal to firm up.
  • Blueberries and Pecans – This version of baked oatmeal is made with fresh or frozen blueberries and chopped pecans, but almost any of your favorite oatmeal mix-ins will work. See below for a few ideas!

pouring liquid ingredients into baking dish

How to Make Baked Oatmeal

It’s so easy!

  1. Whisk together wet ingredients and spices.
  2. Add oats and any fruit or nuts to a greased baking pan.
  3. Pour wet ingredients over dry and stir gently to combine. 
  4. Cover and bake until the oatmeal is golden on the top and all of the liquids have been absorbed.
  5. Let cool slightly. Slice and serve!

How to Reheat Baked Oatmeal Leftovers

Baked Oatmeal is great for meal prep / leftovers, but it does dry out after the first day of serving. Drizzle it with some milk or water before reheating in the microwave. You can also drizzle it with honey or maple syrup after reheating. Or serve it with a spoonful of yogurt. 

Another tip I have is that I store individual portions of the oatmeal in these Rubbermaid Brilliance containers (I have a bunch of these in different sizes that I purchased myself). The lids are designed for microwave use and they keep moisture in while reheating rather than drying food out. 

Variations on Baked Oatmeal

  • Apple Cinnamon – Add chopped fresh apples instead of blueberries.
  • Mixed Berry – Use a variety of fresh or frozen berries.
  • Peanut Butter Banana – Add peanut butter (powdered peanut butter works great too) and chopped bananas.
  • Chocolate Coconut – Stir in chocolate chips and shredded coconut.

baked blueberry oatmeal in a white baking dish

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baked blueberry oatmeal in a white baking dish
4.80 from 5 votes

Baked Blueberry Oatmeal

Baked oatmeal takes just a few minutes to mix up and then the oven does the rest of the work. It's great for make-ahead / meal prep breakfasts or for serving a crowd.
Prep: 10 minutes
Cook: 45 minutes
Total: 35 minutes
Servings: 8

Equipment

  • Mixing Bowl
  • Whisk
  • Baking Dish

Ingredients 

  • 2 Eggs
  • 2 cups Milk (see note)
  • 1/3 cup lightly packed Brown Sugar (substitute honey or maple syrup)
  • 1 tsp Ground Cinnamon
  • 1 tsp Baking Powder
  • 1 tsp Pure Vanilla Extract
  • 2 1/2 cups Rolled Oats (sometimes labeled "Old-Fashioned Oats; do not use Instant or Quick-Cook Oats")
  • 2 cups Blueberries, fresh or frozen
  • 1/2 cup Pecans, roughly chopped (optional)
  • Maple syrup or honey (optional, for serving)

Instructions 

  • Preheat oven to 350°F / 177°C. Spray an 8x8 baking dish (or similar-sized baking dish) with nonstick cooking spray or rub with some oil.
  • In a mixing bowl, whisk eggs together. Whisk in milk, brown sugar, cinnamon, baking powder, and vanilla.
  • Add oats, blueberries, and pecans to prepared baking dish. (Reserve some of the blueberries and pecans if you'd like to sprinkle them on top.)
  • Pour liquids over oats and gently stir everything together in the pan just to encorporate them. Cover the pan tightly with foil.
  • Bake oatmeal until firm in the middle, 35 to 40 minutes.
  • Let oatmeal cool slightly before serving (it will continue to firm up as it rests). Serve with some maple syrup or honey drizzled over top.

Notes

Milk - Any type of milk will work in this recipe (almond, cow's milk, coconut, or oat milk). Apple juice works well too.
Meal Prep - If making the oatmeal ahead to serve throughout the week, let it cool completely before slicing into individual portions. To reheat, drizzle with some milk or water (to rehydrate) and warm it in the microwave. 

Nutrition

Calories: 242kcal | Carbohydrates: 36g | Protein: 8g | Fat: 8g | Saturated Fat: 2g | Cholesterol: 46mg | Sodium: 48mg | Potassium: 319mg | Fiber: 4g | Sugar: 16g | Vitamin A: 140IU | Vitamin C: 4mg | Calcium: 138mg | Iron: 2mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Author: Jess Smith via Inquiring Chef
Cost: $5
Calories: 242
Keyword: baked oatmeal, easy breakfast recipe, oatmeal
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About Jess Smith

Jess is the recipe creator and photographer at InquiringChef.com. She spent nearly a decade as the Chief Recipe Developer for the award-winning meal planning app Cook Smarts. Her colorful, healthyish recipes have been featured in popular online publications including Parade, Hallmark, and HuffPost.

4.80 from 5 votes (5 ratings without comment)

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29 Comments

  1. This looks good, but reads like an adaptation of Heidi Swanson’s Baked Oatmeal from her book, Super Natural Every Day. She uses hard-to-find huckleberries, so I’ve always subbed blueberries. I don’t really know where the line is drawn between inspiration for new recipes vs. adaptation. I adapt about 80% in my kitchen, but I wouldn’t call myself a recipe developer. I look for originality in cookbooks and blogs and this recipe, while good, is simply too derivative without some kind of attribution.

    1. Hi Kim – thank you so much for your note. I wanted to take a minute to fully respond to your comment because, as a person who makes my living as a recipe developer, this is an issue that I take extremely seriously for ethical, and certainly, for legal reasons. This is a recipe that I originally published in early 2011. A quick google search leads me to believe that this was before Heidi’s book was published (but I am a long time fan of her site!), or at least certainly before I could have seen a copy (I was living in Thailand in 2011). Digging through the internet would probably reveal that back in 2011, almost every food blogger was creating their own version of baked oatmeal. It was very trendy back then both on the internet and in restaurants, so while I certainly didn’t invent this method, it was one of those ideas that was just floating around a lot back then. If anything, I think we all might owe credit to Kath over at Kath Eats, as I’ve followed her site for years, and I see that she has a version dating back to at least 2008 (https://www.katheats.com/banana-baked-oatmeal), though even she references seeing other versions before making her own. Recipe development is a funny thing as many sets of ingredients just seem to naturally fit together in similar measurements and methods. (It’s why there are literally thousands of versions of chocolate chip cookies.) I appreciate you reaching out and giving me a chance to fact-check myself. Please rest assured that I tested my own version of this oatmeal several times back in 2011 and several times again this year with no guidance except my own knowledge of how the ingredients might work together. If I take inspiration or adaptation from other places, I always note that just as I would expect other professionals in this field to do for me.

  2. Any thoughts on freezing these after they are baked? My daughter lives in a dorm and has no time to cook. Or, any info on how long these will last (after cooking) in the refrigerator? I think she will love these!

    1. Tam – that’s so sweet of you to think of these for your daughter – I would have loved having them in the dorm! So, I’ve tried a few different variations on this for both freezing and storing in the refrigerator. I haven’t found the perfect solution yet, but they work well if you add some extra liquid (about 1/3 cup) to the recipe and only bake them for half the time. That way they can be frozen and cooked the rest of the way in the microwave (I don’t even defrost them first). Sometimes they really need an extra splash of milk or water after microwaving though – they dry out a bit in the second round of cooking. Hope that helps!

    1. Lisa – you know what? I’ve done it! The only thing I would tell you is that it does much better if you pour the liquid into the jars just before cooking, so it would work best if you keep the dry ingredients and liquid apart until you’re ready. If you do want to add the liquid in advance so that you’re really ready to go when you want them, you’ll likely want to add a bit more water or milk to saturate the oats before baking. (They will absorb the initial liquid while they sit in the fridge, and will need more in order to remain moist while baking.)

    1. Hi Becky – I’ve never tried that swap in this particular recipe. Usually steel cut oats take a bit longer to cook, so I think it’s quite do-able, but you may need to increase the cooking time and probably increase the liquid by at least 1/2 cup. Let me know how it works!

  3. I will make this. I love the mason jar idea – I have been drawn to recipes with mason jars lately. Do you just zap it in the microwave to reheat?

    1. Cyndi – I love the mason jar thing too lately – I’m always looking for ways to use them. I did just zap them in the microwave to reheat, but found they dried out a bit, so I always add a splash of liquid before zapping – milk, juice, or water work great!

    1. Becky – although the honey adds a bit of sweetness, you can skip the honey altogether, but I would substitute a Tablespoon or two of water in its place. Alternatively, you could use jam or jelly – any flavor would be delicious and would be a great fill-in for the honey! Enjoy!

  4. Carrie – you can absolutely use frozen fruit. In most cases, it shouldn’t make a difference in the finished dish. I would just recommend letting the fruit thaw to near room temperature before using it, or it may affect the cooking time.