Irresistible Blueberry Banana Baked Oatmeal Squares Recipe

You know those mornings when you’re rushing out the door but still want something wholesome? That’s exactly why I fell in love with these blueberry banana baked oatmeal squares. They’re my grab-and-go lifesaver – sweet enough to feel like a treat but packed with good-for-you ingredients. The magic happens when juicy blueberries (bursting with antioxidants!) meet ripe bananas (nature’s perfect sweetener) in a cozy oatmeal base. I make a batch every Sunday, and they keep my family fueled all week. Trust me, once you try these blueberry banana baked oatmeal squares warm from the oven with that golden top, you’ll be hooked just like we are!

Two stacked blueberry banana baked oatmeal squares on a plate with fresh blueberries.

Why You’ll Love These Blueberry Banana Baked Oatmeal Squares

Oh my gosh, where do I even start? These little squares have become my kitchen hero for so many reasons. First off, they’re sneaky-good for you – packed with fiber from the oats and vitamins from the fruit. The best part? My kids actually beg for them (win!). You can whip them up in less than 10 minutes of hands-on time – just mix, bake, and voila! I love that they store beautifully in the fridge all week too. Honestly, when breakfast tastes this good and makes life easier, it’s hard not to fall completely in love.

Ingredients for Blueberry Banana Baked Oatmeal Squares

Okay, let’s talk ingredients – this is where the magic starts! I promise you won’t need anything fancy, just simple pantry staples that come together beautifully. I’ve grouped everything so it’s super easy to prep. Pro tip: measure everything before you start mixing – it makes the whole process go so much smoother!

Dry Ingredients

  • 2 cups rolled oats (old-fashioned works best, not instant!)
  • 1 tsp baking powder (that lift makes all the difference)
  • ½ tsp salt (trust me, it balances the sweetness perfectly)

Wet Ingredients

  • 2 ripe bananas, mashed – the spottier the better! (Want more banana flavor? Check out my banana bread recipe)
  • 1 cup milk (I use almond milk, but any kind works great)
  • 1 large egg
  • 2 tbsp maple syrup (honey works too if you’re out)
  • 1 tsp vanilla extract (the good stuff – no imitation here!)

Add-ins

  • 1 cup blueberries (fresh or frozen both work perfectly – no need to thaw!)

See? Nothing complicated! This is one of those healthy breakfast recipes where quality ingredients really shine. Just promise me you’ll use those super ripe bananas – they’re the secret to natural sweetness in every bite!

How to Make Blueberry Banana Baked Oatmeal Squares

Alright, let’s get baking! I promise this is so easy you’ll have it memorized after one try. The key is taking it step by step – and don’t worry, I’ve made all the mistakes so you don’t have to!

Step 1: Preheat and Prep

First things first – crank that oven to 375°F (190°C). While it’s heating up, grab your 8×8-inch baking dish and give it a quick grease. I use butter or coconut oil, but cooking spray works too. This little step saves so much frustration later when your squares pop out perfectly!

Step 2: Mix the Dry Team

In your favorite mixing bowl (mine’s the big yellow one with the chip in the rim), whisk together the oats, baking powder, and salt. The baking powder is our rising hero here – it gives these squares just the right amount of lift without making them cakey.

Step 3: Blend the Wet Crew

Now for the fun part – in another bowl, mash those bananas until they’re nice and smooth (a few lumps are totally fine!). Add in the milk, egg, maple syrup, and vanilla. Pro tip: if you love banana flavor as much as I do, try using extra ripe bananas like in my banana bread recipe. Whisk it all together until it looks like a creamy, dreamy liquid gold.

Step 4: Combine and Fold

Pour your wet mixture into the dry ingredients and stir gently – just until everything’s combined. Overmixing makes tough squares, and nobody wants that! Now carefully fold in those beautiful blueberries. If you’re using frozen ones (which I do half the time), don’t thaw them first – they’ll bleed less color this way.

Step 5: Bake to Perfection

Spread your batter evenly in the prepared dish – I use a spatula to get into the corners. Pop it in the oven for about 30 minutes. You’ll know it’s done when the edges pull away slightly and the top turns this gorgeous golden brown. Your kitchen will smell like a cozy breakfast cafe!

Close-up of a blueberry banana baked oatmeal squares piece topped with fresh blueberries on a white plate.

Step 6: The Hardest Part – Waiting!

Okay, I know it’s tempting, but let it cool for at least 15 minutes before cutting. This helps the squares set so they don’t crumble when you lift them out. If you can resist, they actually taste even better the next day when all the flavors have mingled. But who am I kidding? I always “test” one warm with a drizzle of extra maple syrup!

Tips for Perfect Blueberry Banana Baked Oatmeal Squares

After burning through more batches than I’d like to admit (oops!), I’ve learned all the tricks for making these blueberry banana baked oatmeal squares absolutely foolproof. Let me save you from my early kitchen disasters with these hard-won secrets!

Banana Ripeness is Everything

Those brown-speckled bananas sitting on your counter? They’re gold! The riper they are, the sweeter and more flavorful your squares will be. I once made the mistake of using barely yellow bananas – let’s just say my kids asked where all the flavor went. Now I wait until they’re practically begging to be baked.

Say No to Soggy Bottoms

Nothing worse than cutting into a perfect-looking square only to find a mushy mess underneath. Here’s my trick: let the baked oatmeal rest for at least 15 minutes before slicing. This gives the oats time to set up properly. And if you’re using frozen blueberries? No need to thaw – they’ll release less juice during baking.

Sweetness to Your Taste

These squares are naturally sweet from the bananas, but I know everyone’s different. Start with the 2 tablespoons of maple syrup, then taste your batter (yes, raw egg and all – I live dangerously!). Want more sweetness? Add an extra tablespoon. Prefer less? The bananas alone might be enough for you.

The Golden Top Test

Don’t trust the timer alone – your nose and eyes are better guides. When the edges pull away from the pan and the top turns that perfect golden brown, they’re done. A toothpick should come out with moist crumbs, not wet batter. I learned this the hard way after one overbaked batch that could’ve doubled as hockey pucks!

Storage and Reheating Instructions

Let me tell you my foolproof system for keeping these blueberry banana baked oatmeal squares tasting fresh all week! Once cooled completely (this is key!), I stack them in an airtight container with parchment between layers. They’ll stay perfect in the fridge for up to 5 days – though mine never last that long!

For longer storage, freeze them individually wrapped in foil, then pop into a freezer bag. They’ll keep for a month – just thaw overnight in the fridge. The texture changes slightly when frozen (the oats get a bit denser), but they’re still delicious. My favorite quick reheat? 30 seconds in the microwave for that just-baked warmth. For extra crispiness, toast them in a toaster oven until the edges get slightly caramelized. Either way, you’ve got breakfast ready in seconds!

Stack of blueberry banana baked oatmeal squares topped with fresh blueberries.

Nutritional Information

Just a quick note before we dive in – these nutritional values are estimates and can vary based on your specific ingredients. But here’s the scoop on what you’re getting in each delicious square: about 120 calories, 22g carbs (hello, energy!), 3g protein to keep you full, and 3g fiber for happy digestion. Not too shabby for something that tastes this good, right? The bananas and blueberries pack in potassium and antioxidants too – bonus points for being secretly good for you!

Frequently Asked Questions

Can I use frozen blueberries?

Absolutely! Frozen blueberries work perfectly – no need to thaw them first. Just toss them in frozen to prevent too much juice bleeding into the batter. They’ll bake up beautifully and keep your squares from getting soggy.

How to make it vegan?

Easy peasy! Swap the egg for a flax egg (1 tbsp ground flax + 3 tbsp water), use plant-based milk, and make sure your maple syrup is vegan. The bananas do all the heavy lifting for texture anyway!

Can I double the recipe?

You bet! Double everything and use a 9×13-inch pan instead. Just add 5-10 minutes to the baking time. I do this every Sunday – one pan for now, one to freeze for later (if it lasts that long!).

Close-up of blueberry banana baked oatmeal squares topped with fresh blueberries on a white plate.

Blueberry Banana Baked Oatmeal Squares

These baked oatmeal squares combine blueberries and bananas for a nutritious breakfast or snack.
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings: 12 squares
Course: Breakfast, Snack
Cuisine: American
Calories: 120

Ingredients
  

Dry Ingredients
  • 2 cups rolled oats
  • 1 tsp baking powder
  • 1/2 tsp salt
Wet Ingredients
  • 2 ripe bananas mashed
  • 1 cup milk dairy or plant-based
  • 1 egg
  • 2 tbsp maple syrup
  • 1 tsp vanilla extract
Add-ins
  • 1 cup blueberries fresh or frozen

Equipment

  • 8×8-inch baking dish
  • Mixing bowl

Method
 

  1. Preheat the oven to 375°F (190°C). Grease an 8×8-inch baking dish.
  2. In a mixing bowl, combine the oats, baking powder, and salt.
  3. In another bowl, mix the mashed bananas, milk, egg, maple syrup, and vanilla extract.
  4. Pour the wet ingredients into the dry ingredients and stir until combined.
  5. Fold in the blueberries.
  6. Pour the mixture into the prepared baking dish and spread evenly.
  7. Bake for 30 minutes or until the top is golden and the center is set.
  8. Let cool before cutting into squares.

Nutrition

Calories: 120kcalCarbohydrates: 22gProtein: 3gFat: 2gSaturated Fat: 0.5gCholesterol: 15mgSodium: 150mgPotassium: 150mgFiber: 3gSugar: 8gVitamin A: 50IUVitamin C: 4mgCalcium: 60mgIron: 1mg

Notes

Store leftovers in an airtight container in the refrigerator for up to 5 days. Reheat before serving if desired.

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