Blueberry Banana Baked Oatmeal

$4.18 recipe / $0.52 serving
by Beth Moncel
4.81 from 42 votes
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Will I ever get tired of baked oatmeal? Probably not. It’s easy, cheap, deceptively filling, and I can cook it one day and then eat it throughout the rest of the week.

I love this version because I barely had to add any extra sugar thanks to the super sweet bananas. I used only 1/4 cup for the entire batch, and honestly, I probably could have cut that down to 2 Tbsp. Bananas are fantastic. The frozen blueberries were delightfully tart against the sugary bananas, which made them a perfect mate. If you’re lucky enough to have fresh blueberries, this recipe is a great way to use them up!

If you’ve got a few extra bucks, adding some nuts would be a nice texture contrast (try walnuts or almonds)!

Blueberry Banana Baked Oatmeal

Top view of a bowl of Blueberry Banana Baked Oatmeal

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Blueberry Banana Baked Oatmeal

4.81 from 42 votes
Fresh fruit and rich, custardy oats make this baked oatmeal a filling and flavorful "fix ahead" breakfast. Just heat and eat each morning!
Author: Beth Moncel
Blueberry banana oatmeal topped with fresh blueberries.
Servings 6 -8
Prep 15 minutes
Cook 45 minutes
Total 1 hour

Ingredients

  • 1.5 cups mashed bananas (about 3 bananas) ($0.75)
  • 2 large eggs ($0.50)
  • 1/4 cup white sugar ($0.04)
  • 3/4 tsp vanilla extract ($0.21)
  • 1/2 tsp salt ($0.02)
  • 3/4 tsp baking powder ($0.03)
  • 2 cups milk ($0.50)
  • 2.5 cups old fashioned oats ($0.43)
  • 8 ounces frozen blueberries ($1.70)
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Instructions 

  • Preheat your oven to 375 degrees. Mash the bananas in a measuring cup, starting with two or three and adding more until you have 1.5 cups of banana mash.
  • Combine the banana mash in the large bowl with the eggs, sugar, vanilla, salt, and baking powder. Whisk to combine. Add the milk and whisk again until smooth.
  • Stir in the dry old-fashioned oats. Lastly, stir in the frozen blueberries (keeping them frozen and stirring them in last helps prevent the entire mix from turning purple). Spray an 8×8 inch baking dish with non-stick spray and then pour in the oat mixture.
  • Bake in the preheated 375 degree oven and bake for about 45 minutes or until the top is golden brown and the center is no longer wet to the touch.

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Notes

Serve warm or refrigerate until ready to eat. These oats can be quickly reheated in the microwave each morning for a quick, filling breakfast.

Nutrition

Serving: 1ServingCalories: 305.87kcalCarbohydrates: 53.05gProtein: 9.98gFat: 6.97gSodium: 306.78mgFiber: 5.92g
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Top view of a bowl of Blueberry Banana Baked Oatmeal with whole dish of oatmeal and a cup of coffee in the background

Step By Step Photos

mashed bananas in measuring cup
Mash the bananas with a fork, starting with just a couple and adding more until you have 1.5 cups of banana mash. Try not to leave any large chunks. (last time it took me 4 medium bananas, this time only 3).

custard ingredients in mixing bowl
Add the banana mash to a bowl along with the eggs, vanilla, sugar, baking powder, and salt. Whisk until smooth.

milk added to custard ingredients in mixing bowl and whisked with whisk
Next, add the milk and whisk again. It’s a lot easier to make a smooth, cohesive mixture if you whisk the other ingredients prior to adding the milk. That’s why it’s done in two steps.

dry oats added into. mixing bowl with other ingredients
Stir in the dry oats. It’s easier to stir them in with a large spoon than a whisk, but I didn’t feel like dirtying another utensil.

package of frozen blueberries
I love having frozen blueberries on hand. They’re a great addition to many dishes, are less expensive than fresh, and keep for quite a while in the freezer. I used half a bag for this recipe (and used the rest for my smoothie packs).

oatmeal mixture poured into baking dish, ready to bake
Keep the blueberries frozen until you add them so they don’t bleed purple color throughout the oatmeal. Adding them at the very end helps this as well. Pour the blueberry oat mixture into an 8×8 inch casserole dish that has been sprayed with non-stick spray.

baked blueberry banana oatmeal in baking dish on stove top
Bake for about 45 minutes at 375 degrees or until the top is golden brown and no longer wet to the touch in the center. I baked this oatmeal at 25 degrees higher than my other baked oatmeals to compensate for the little blueberry ice cubes floating around in it. It worked out well.

Bowl of Blueberry Banana Baked Oatmeal with a cup of coffee in the background
I like to eat mine with a little bit of cold milk poured over top. This makes for a very fast, very hearty breakfast every morning of the week!

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Comments

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  1. So glad I found this recipe-was getting really tired of yogurt!! Just made it for breakfasts for the rest of the week. Hol-leee cow this is is good!! Was really simple and convienient since I Had everything on hand. Can’t wait to try the other versions

  2. Can any of your baked oatmeal recipes be assembled in the crockpot and cooked all night? If not, will you create one for me??

    I’ve made several of your oatmeal recipes and love them all, just looking for a version that I could feed a small group with in the morning without having to wake up early and assemble and cook it!

    1. I’ve never tried that, but it’s a great idea! I’ll see if I can come up with a good recipe for that. :)

  3. I’m excited to try this recipe. I’m wondering if you think it would work to prep this the night before, and then add in the blueberries and bake it in the morning. Don’t some people soak their oats before cooking?

    1. Yes, I think that would work. The cooking time might change slightly because everything will be chilled when going into the oven, but other than that it should work fine. :)

  4. It tastes good, but the texture feels spongey. Is there a way to fix that? The only changes to the recipe was that I did have to supplement milk with almond milk.

  5. I’m converted! I’ve simply been eating instant oatmeal with frozen fruit stirred in every morning, but it was getting pretty boring. I love the texture that comes with baking it. I used 2 Tbsp sugar for this, which was just the right amount of sweetness. This was also a good way to use up some nearly overripe bananas.

  6. Do you think I could skip the bananas and have it turn out the same? Or is there some sort of replacement? I’m allergic :/

    1. I wouldn’t suggest just leaving it out because they hold a lot of moisture in the dish, but in other baked oatmeals I’ve used apple sauce or yogurt in place of the bananas. :)

      1. I supplement with yogurt whenever I don’t have quite enough banana mash.

  7. I made this recipe last week and it came out awesome! I just had a question as to how long this recipe (and the other baked oatmeal recipes, I want to try and make a different one each week!) keeps–I’ve had it in the fridge in a covered container for maybe a week now and I’ve been slowly eating it pretty much every morning since I made it. It doesn’t taste or smell off but I’m one of those paranoid types that tends to pour any remaining milk out on the sell-by date. Does it freeze well?

    1. It does freeze great, as a matter of fact. I try to use up most cooked dishes within five days of being in the fridge. There is no real hard line between good and bad and the rate of deterioration will depend on a lot of different factors, including the refrigerator’s settings. :/

  8. Made this last night, and it was fantastic! Mine turned out more like a cake than oatmeal, but just not as sugary!

    The next day I warmed some up, poured on some milk and sprinkled some brown sugar on top. It was delicious! A great breakfast, or even a great snack!

  9. I used unsweetened vanilla coconut almond milk and fresh blueberries, since that was what I had on hand. I also added four Tbsp of chia seeds. This turned out absolutely delicious and the leftovers reheat perfectly the next morning.

  10. This is a keeper! I reduced the sugar to 2Tbps and added 2Tbsp each of chia seeds and ground flax seeds just to beef up the nutritional content. My husband and I enjoyed this recipe and I plan on making it again!

  11. I’ve whipped up quite a few of your baked oatmeals, and the addition of banana is brilliant! The banana taste combined with the custardy texture is simply delish! I used some banana that I had in the freezer (thawed in warm water) and fresh strawberries that I had on hand instead of blueberries. Another win!

  12. I subbed the white sugar for brown and added a handful of chopped almonds and two tbsp of cinnamon. YUM! Love your baked oats recipes

  13. I have never made baked oatmeal before…I was wondering, does anyone eat this straight like bread? Or with yogurt? Or is it pretty standard to pour milk over it? I am weird about textures and this looks DELISH but I am worried it might get mushy in milk and that my picky palate couldn’t take it.

    1. It already has a mushy-ish texture, so you might not like it. It’s kind of like oatmeal baked into a custard, if you can imagine how soft and mushy custard is. The outer edges get a little more solid, but overall it’s a soft, fairly moist dish.

    2. Mine always seems to bake fairly solid (maybe I’m doing something wrong, maybe it’s my uneven oven) usually I cut myself a slice in the morning like I would a piece of cake, heat it briefly in the microwave and it’s yummy :) then I can drink a milky coffee with it and have best of both worlds!