High-Protein Oatmeal Brownie with Sour Cherries
This high-protein oatmeal brownie with sour cherries is a sweet, sour, and chocolatey snack that bakes in one pan from a handful of wholesome ingredients. It is blended in a food processor, naturally gluten-free, refined sugar-free, and sweetened only by ripe bananas, so it works as a fuss-free afternoon treat or a post-workout bite that actually fills you up.
How this recipe came to be
Ever since Costin and I started working out, I have been looking for creative ways of adding more protein to our diet, and what better way to enjoy a boost of protein than with a delicious, sweet treat. I am not a huge fan of oatmeal myself — my husband eats it on a regular basis — but I do love using oats in desserts. That is how I came up with the idea of baking oatmeal brownies that are both healthy and nutritious.
Yesterday, while looking for a snack that would give us a high dose of protein, I decided to experiment with a couple of ingredients I had on hand. When my husband tasted my creation for the first time, he was amazed at how delicious and nutritious they were. Overall, I am proud that my experiment was a success.
The ingredients you need
This is a short list, and every item earns its place. Here is what goes into the food processor and why it matters:
- Three large ripe bananas — these are the only sweetener and most of the moisture. The riper the better; brown-speckled bananas are sweeter and blend into a smoother puree.
- 6 tablespoons cocoa powder — this carries the chocolate flavor. Unsweetened cocoa keeps the brownies refined sugar-free.
- 2 eggs — they bind the batter and add protein and structure.
- 2 scoops whey protein powder — the main protein boost. A chocolate or vanilla whey both work here.
- 2 cups oats — they replace flour and add fiber. Use certified gluten-free oats if you need the brownies to be fully gluten-free.
- 1 cup pitted sour cherries — thawed from frozen, scattered on top for that bright, tangy zing against the chocolate.
- ½ teaspoon baking soda — a little lift so the brownies are not dense.
Tips for getting them right
- Use the ripest bananas you have. Since they are the only sweetener, underripe bananas will leave the brownies tasting flat.
- Blend the batter until it is smooth and well combined so the oats break down and the texture is even.
- Spread the batter evenly and smooth the top with a spatula before adding the cherries — an even layer bakes more uniformly.
- Scatter the thawed cherries on top rather than mixing them in, so they stay whole and juicy instead of bleeding into the batter.
- Check doneness with the toothpick test: insert it in the center, and it should come out clean. Start checking at the 25-minute mark so you do not overbake.
- Let the tray cool for a few minutes before slicing. Warm brownies are fragile and crumble; a short rest helps them hold their shape.
Why this method works
Blending everything in a food processor does two jobs at once: it purees the bananas into a smooth base and grinds the oats so they behave like flour, which is what gives the brownies a tender, cake-like crumb instead of a chewy, oaty one. The bananas bring natural sugars and moisture, while the eggs set as they bake and lock the structure together. The sour cherries are the deliberate counterpoint — their tartness cuts through the rich cocoa so the brownies taste balanced rather than one-note sweet.
Substitutions and a vegan note
I believe these can be made vegan too if you skip the eggs, though you may need to add a little bit of almond milk to the mixture so the batter stays moist enough to bake. If you prefer a different fruit, you can swap the sour cherries for another tart berry, and any chocolate or vanilla whey protein will work in place of the one you have. I am also planning to try a variation of this oatmeal brownie recipe with chocolate and peanut butter over the next couple of days.
If you are after fully plant-based options, browse my gluten-free vegan brownies and these protein-packed black bean brownies for inspiration.
Storage and make-ahead
Once the brownies have cooled completely, store them in an airtight container in the fridge, where they keep well for several days — the chill firms them up and makes them even easier to slice. They also freeze nicely: wrap individual squares and thaw a piece whenever you want a quick snack. Because they are portable and filling, they are perfect to make ahead for a busy week or to pack after an at-home HIIT workout. If you like building treats like this into your routine, you might also enjoy my other high-protein meal ideas and these naturally sugar-free desserts.
If you bake these, I would love to know how they turned out for you — did you keep the sour cherries or try a different fruit? Leave a rating and a comment below with your tweaks, especially if you test the vegan version.
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High Protein Oatmeal Brownie with Sour Cherries
Ingredients
- 3 ripe bananas large
- 6 Tbsps cocoa powder
- ½ tsp baking soda
- 2 eggs
- 2 scoops whey protein powder
- 2 cups oats
- 1 cup pitted sour cherries thawed from frozen
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, 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 thawed sour cherries on top.
- 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
No, this recipe is vegetarian, not vegan, because it uses 2 eggs and whey protein powder, which is a dairy product. The eggs bind the batter and add structure. You can try a vegan version by skipping the eggs and adding a little almond milk so the batter stays moist, but the original recipe as written is vegetarian.
They can be. The recipe contains no flour, only oats, so it is naturally wheat-free. To make it fully gluten-free, use certified gluten-free oats, since standard oats are often cross-contaminated with gluten during processing.
A food processor makes it easiest because it purees the bananas and grinds the oats into a smooth, flour-like batter in one step. If you do not have one, you can mash the bananas well by hand and use oat flour or finely ground oats, then stir everything together until smooth and combined.
Yes. The recipe calls for pitted sour cherries thawed from frozen, but fresh pitted sour cherries work just as well. Scatter them on top of the batter rather than mixing them in so they stay whole and add bright, tangy pockets against the chocolate.
Bake at 180C for 25 to 30 minutes, then use the toothpick test: insert a toothpick into the center, and it should come out clean. Start checking at the 25-minute mark to avoid overbaking, and let the tray cool for a few minutes before slicing so the brownies hold their shape.
Once fully cooled, keep them in an airtight container in the fridge for several days; chilling firms them up and makes slicing easier. They also freeze well, so wrap individual squares and thaw a piece whenever you want a quick, protein-rich snack.
