High-Protein Banana Bread Baked Oats

Name: High-Protein Banana Bread Baked Oats
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Ingredients: 2 cups rolled oats; 2 scoops vanilla protein powder ((optional)); ¼ cup chopped walnuts; ½ tsp salt; 1½ tsp baking powder; ½ tsp cinnamon ((optional)); 1 cup egg whites; ½ cup unsweetened plant-based milk (or milk of choice); ½ cup peanut butter; ⅓ cup maple syrup; 2 tsp vanilla extract (or vanilla bean paste); 2 ripe bananas; 1 ripe banana (halved lengthwise, for topping); 1 tbsp peanut butter (warmed, for drizzling); 2 tbsp chopped walnuts (for topping)

In this post:

Why You’ll Love It
Key Ingredients
How to Make It
Tips
Recipe Variation Ideas
Storage & Meal Prep
FAQ
More High-Protein Breakfast Recipes
The Recipe

If you’ve got overripe bananas sitting on your counter and you’re thinking banana bread… try this instead.

This High-Protein Banana Bread Baked Oatmeal has all the warm, cozy flavor of a fresh loaf, but it’s made for breakfast. Soft, sliceable, and full of protein and fiber so it actually keeps you full.

My husband loves bananas, buys a huge batch, and then completely forgets about them. So there are always brown bananas in my kitchen, and this is my favorite way to use them.

Everything comes together in one bowl, bakes up in under 45 minutes, and tastes like banana bread in bar form. The peanut butter adds richness, the walnuts give it that classic banana bread crunch, and the drizzle on top makes it just a little bit extra special.

I make this on the weekend, slice it into squares, and eat it all week. It reheats in seconds and honestly, it’s one of those breakfasts that makes me look forward to Monday morning.

Single square of banana bread baked oatmeal on a spatula

Why You’ll Love It

Classic banana bread flavor with ripe bananas, warm peanut butter, and chopped walnuts
25 grams of protein and 6 grams of fiber per square
Simple one-bowl prep that comes together in minutes
Soft, tender texture that slices neatly into grab-and-go squares
Perfect for meal prep and stays fresh for several days
Sweet enough to feel indulgent while still being nourishing and balanced

Craving more banana bread breakfast ideas? Try these High-Protein Banana Bread Overnight Oats for an easy no-bake version.

Fork pressing into a banana bread baked oatmeal square topped with yogurt and walnuts

Key Ingredients

Rolled oats: The base of the baked oatmeal, giving it a tender, soft-baked texture that holds up well for meal prep. Use gluten-free oats if you’re gluten-intolerant.
Ripe bananas: The star here. They add natural sweetness, moisture, and that unmistakable banana bread flavor. The riper, the better (brown spots are what you want).
Peanut butter: Adds richness and helps bind the bars together. Peanut butter and banana is a hard combo to beat.
Walnuts: Chopped and mixed into the batter plus sprinkled on top for that classic banana bread crunch.
Maple syrup: Pure Maple Syrup has natural sweetness that pairs perfectly with the banana and peanut butter.
Egg whites: A lean source of protein that keeps the texture soft without making the bars dense.
Plant-based milk: Adds moisture to create that soft, sliceable baked oatmeal consistency.
Vanilla protein powder: A little bit of protein powder goes a long way without changing the flavor or texture. Vanilla works best here since it complements the banana bread taste.

Love baked oats? These Almond Croissant Baked Oatmeal Squares are another great flavor combo to try.

How to Make It

This banana bread baked oatmeal comes together easily in one bowl and bakes into soft, tender squares that are perfect for meal prep.

Mashed bananas whisked with peanut butter and egg whites in a mixing bowl

Mash the bananas and mix the wet ingredients
In a large bowl, mash 2 ripe bananas. Then add the egg whites, plant-based milk, peanut butter, maple syrup, and vanilla extract. Whisk until smooth and fully combined.

Rolled oats, walnuts, and protein powder added to banana batter in a mixing bowl

Stir in the dry ingredients
Add the rolled oats, vanilla protein powder, chopped walnuts, salt, baking powder, and cinnamon (if using). Stir until everything is evenly combined.

Unbaked banana bread oatmeal in a dish topped with banana halves and peanut butter drizzle

Top and bake
Pour the batter into a parchment-lined baking dish and smooth the top. Drizzle with warmed peanut butter, sprinkle with chopped walnuts, and place the banana halves cut-side up on top. Bake until the center is set and the edges are lightly golden.

Slice of banana bread baked oats lifted from the baking dish with bananas in the background

Cool and slice
Let the baked oatmeal cool before slicing into squares for easy meal prep.

Love banana bread flavors? Try this High-Protein Banana Bread Yogurt Parfait for another way to get the same taste with lots of protein.

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Tips

Make it gluten-free: Use certified gluten-free rolled oats to keep this recipe fully gluten-free.
Use very ripe bananas: The browner the banana, the sweeter and more flavorful the baked oatmeal will be. If your bananas aren’t ripe enough, you can bake them in their peel at 300°F for about 15 minutes to soften and sweeten them.
Warm the peanut butter: Slightly warm the peanut butter before whisking. It blends more smoothly with the other wet ingredients.

Recipe Variation Ideas

Swap the nut butter: Almond butter or cashew butter both work well here if you prefer them over peanut butter.
Add chocolate chips: Fold in a handful of dark chocolate chips for a banana bread meets banana muffin vibe.
Make it less sweet: Leave out the maple syrup for a more lightly sweet breakfast bar.
Add cinnamon: Half a teaspoon of cinnamon gives it a warmer, spiced banana bread flavor.
Turn it into oat muffins: Divide the batter into a lined muffin tin and bake for 20 to 25 minutes.

Storage & Meal Prep

Store the baked oatmeal in an airtight container in the refrigerator for up to 4 days.

The squares hold their shape well and reheat quickly in the microwave or oven.

For meal prep, slice the bars and separate them with parchment paper so they are easy to grab throughout the week.

You can also freeze individual squares for up to three months and thaw them overnight in the fridge.

FAQ

Can I use quick oats instead of rolled oats?

Yes. Quick oats will work, but they create a softer, more uniform texture since they absorb liquid faster. If you prefer baked oatmeal that feels a little heartier with more structure, rolled oats are the better choice.

Can I leave out the maple syrup?

Yep, the bananas already add a good amount of natural sweetness on their own.

Can I skip the protein powder?

You can, but you’ll lose some protein per square. If you leave it out, the texture won’t change much, the bars will still hold together fine.

Can I freeze the baked oatmeal?

Definitely. Let it cool completely, slice it into squares, and freeze in an airtight container for up to three months. Thaw overnight in the fridge or reheat from frozen in the microwave for a quick breakfast.

What’s the best way to reheat it?

A quick 15 to 20 seconds in the microwave warms it through without drying it out. You can also pop a square into an air fryer if you prefer crispier edges.