Chocolate Oats Brownies with Peanut Butter
These chocolate oats brownies with peanut butter are a healthy twist on a classic dessert: high-protein, banana-sweetened and ideal as a post-workout snack. Give them a try!
Chocolate oats brownies are fudgy, high-protein brownies made by blending ripe bananas, oats, cocoa powder, eggs and whey protein into a smooth batter, then baking it and topping each square with peanut butter and melty chocolate discs. There is no added sugar and no flour: the bananas do the sweetening and the oats blend down into their own oat flour right in the food processor. They come together in one bowl (well, one blender), bake in under half an hour, and hit that sweet-and-chocolatey craving without weighing you down.
As I was sitting in my kitchen today, I couldn’t help but crave something sweet and chocolatey. But I didn’t want to make anything too high in calories or sugary, so I decided to tweak a recipe I already loved and try a different flavor. My high-protein oatmeal brownies were the starting point, and that’s how I came up with this chocolate oatmeal brownie with peanut butter recipe. To take it to the next level, I added peanut butter for richness and a few chocolate discs on top of each brownie.
Ingredients you’ll need
Everything goes into the food processor, so there is no separate mixing or creaming step. Here is what each ingredient does:
- Ripe bananas (3 large): the natural sweetener and the binder. The riper and spottier they are, the sweeter your brownies, so save your speckled bananas for this.
- Cocoa powder (6 Tbsp): unsweetened cocoa gives that deep, rich chocolate flavor without any added sugar.
- Baking soda (½ tsp): a little lift so the brownies aren’t dense as a puck.
- Eggs (2): they set the structure and keep everything held together.
- Whey protein powder (2 scoops): the protein boost that makes these a proper post-workout snack. Chocolate or vanilla both work.
- Oats (2 cups): blended right in the processor, they turn into oat flour and give the brownies their chewy texture and fiber.
- Peanut butter (3 Tbsp): blended into the batter for a nutty richness that runs all the way through.
- Chocolate discs (6): pressed on top before baking so you get molten pools of chocolate on every piece.
Tips for the best chocolate oats brownies
- Blend until truly smooth. You want the oats fully broken down into flour so the batter is even and the texture is fudgy, not gritty.
- Use very ripe bananas. This is where the sweetness comes from. Firm yellow bananas will taste flat.
- Line the tray with parchment. The banana-and-protein batter can stick, and parchment lets you lift the whole slab out cleanly.
- Don’t overbake. Twenty-five to thirty minutes at 180C is the window. Check with a toothpick: it should come out clean, but pull them the moment it does so they stay moist.
- Let them cool before slicing. They firm up as they cool, so a few minutes of patience gives you clean squares instead of a crumble.
Easy swaps and variations
I love how versatile this baked oats brownie recipe is. Once you have the base down, you can play with it endlessly:
- Different nut butter: swap the peanut butter for almond butter, or use sunflower seed butter to keep it nut-free.
- Any protein flavor: vanilla, chocolate or salted caramel whey all play well with the cocoa base.
- Add-ins: fold in chopped walnuts, a handful of berries, or extra chocolate chips before baking.
- More protein snacks: if you like this style of high-protein treat, my homemade protein bars are a no-bake companion, and you can browse my full collection of brownie and blondie recipes for more ideas.
How to store and freeze them
Because these brownies are made with banana and eggs, they keep best in the fridge. Store them in an airtight container for 3 to 4 days. They also freeze beautifully: wrap the squares individually and freeze for up to a couple of months, then let one thaw at room temperature or warm it gently when a chocolate craving hits. A quick 10 seconds in the microwave brings back that just-baked, melty-chocolate feel.
What to serve them with
These are my go-to snack straight after a workout, but they double as an easy everyday dessert. Serve one slightly warm with a coffee, or plate it alongside a spoonful of chocolate mousse when you want something a little more indulgent. If you are keeping things light, they slot right into my roundup of sugar-free desserts, since all the sweetness here comes from the bananas.
Why this recipe works
The magic is in the blend. Ripe bananas bring both sweetness and moisture, the eggs bind and set the crumb, and the oats grind into a flour that gives structure without any wheat. Whey protein could easily dry out a bake, but the bananas and peanut butter carry enough fat and moisture to keep the brownies soft and fudgy. Everything blends into one smooth batter, which is why these are so forgiving and so quick.
I hope you’ll give my chocolate oats brownies a try. If you do, please come back and leave a star rating and a comment below telling me which nut butter or protein flavor you used. It really helps other readers and makes my day.
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Chocolate Oats Brownies with Peanut Butter
Ingredients
- 3 ripe bananas large
- 6 Tbsps cocoa powder
- ½ tsp baking soda
- 2 eggs
- 2 scoops whey protein powder
- 2 cups oats
- 3 Tbsps peanut butter
- 6 chocolate discs
Instructions
- Preheat the oven to 180C and line a baking tray with parchment paper.
- Add the bananas, cocoa powder, baking soda, eggs, whey protein powder, peanut butter and oats to a food processor.
- Blend until the mixture is smooth and well combined.
- Pour the mixture onto the prepared baking tray and smooth it out with a spatula.
- Add the chocolate discs on top of each brownie.
- Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
- Remove from the oven and let cool for a few minutes before slicing and serving.
Frequently Asked Questions
They are a lighter take on classic brownies. There is no added sugar, since the sweetness comes entirely from ripe bananas, and the base is whole oats blended into oat flour instead of white flour. The eggs and whey protein make them higher in protein than a standard brownie, which is why they work well as a post-workout snack.
Yes. If you leave out the two scoops of whey, add a little extra oats or oat flour so the batter still has enough body to set. The brownies will be lower in protein and a touch softer, but they will still bake up fudgy and chocolatey.
Oats are naturally gluten-free, so if you use certified gluten-free oats and a gluten-free protein powder, the recipe is gluten-free. Always check the label on your oats and chocolate discs, since some brands are processed alongside wheat.
As written it is vegetarian, because it uses eggs and whey protein. To make a vegan version you would swap the eggs for flax eggs and use a plant-based protein powder, though this changes the texture and is a different recipe. For a naturally vegan option, try one of the plant-based brownie recipes linked in the post instead.
Gummy usually means they were underbaked or the bananas were not blended smooth, while dry means they baked too long. Blend the batter fully so the oats break down, and pull the brownies as soon as a toothpick comes out clean, around 25 to 30 minutes at 180C.
Store them in an airtight container in the fridge for 3 to 4 days, since they contain banana and egg. They also freeze well for up to a couple of months, wrapped individually, so you can thaw or gently warm one whenever a craving hits.
