Protein Brownies: Easy, Fudgy with a Protein Boost
Dense, fudgy protein brownies made with dark chocolate and skyr. A balanced version of a classic brownie with extra protein.
I really enjoy cooking with protein powder and developing recipes that rework traditional bakes and desserts into versions that are lower in calories and sugar, with a higher protein content, without losing what makes them enjoyable to eat. The challenge is knowing when to stop — it’s easy to push the protein too far and end up with something that no longer tastes like what it was supposed to, and tastes more like an overpriced protein bar you pick up in the supermarket. These protein brownies do not fall into that category.
These protein brownies are dense, dark, and indulgent, with a deep chocolate flavour and a soft, fudgy centre. With 175 calories and 7 grams of protein per piece, they have noticeably less calories and significantly more protein than a regular brownie, but thanks to skyr keeping the centre moist and fudgy, you wouldn’t even realise you are eating a lighter, healthier version.
Ingredients Breakdown
Dark Chocolate
Forms the backbone of the brownies, providing bitterness, depth, and structure; use 70–85% cocoa for a rich flavour that doesn’t add too much suagr
Butter
Supplies fat for richness and proper setting, giving the brownies their dense texture and clean bite once cooled. Regular butter or less unhealthy vegan alternative both work here.
Skyr
Adds moisture and protein while keeping the centre soft and fudgy rather than dry; full-fat Greek yoghurt can be used if skyr isn’t available, but the texture will be slightly looser, and the protein count will be less.
Eggs
Provide structure and binding without lift, allowing the brownies to set cleanly while staying dense rather than cakey.
Whey Protein Powder
Increases protein content without overwhelming the texture when used in moderation; as we are making brownies, chocolate whey works best, but if you want to mix it up a little go ahead. Peanut butter would also be excellent in my opinion.
Cocoa Powder
Deepens the chocolate flavour and absorbs excess moisture, helping counterbalance the protein powder and maintain a tight crumb.
Oat Flour
Adds just enough structure to hold the brownies together while keeping them tender; finely ground oats work well if you don’t have oat flour to hand as it is literally the same thing.
Sugar
Balances bitterness from the cocoa and chocolate and supports proper texture; reducing it further would compromise both flavour and structure.
Protein Brownies Step-by-Step Instructions
Prepare the tin and oven
Heat the oven to 170°C fan. Line a 23 × 23 cm square tin with baking paper, leaving an overhang so the brownies can be lifted out cleanly once cooled.
Melt the chocolate and butter
Place the dark chocolate and butter in a heatproof bowl and melt gently over a pan of barely simmering water, or in short bursts in the microwave. Stir until smooth and glossy, then remove from the heat and allow it to cool slightly.
Mix the wet ingredients
Whisk the skyr, eggs, and sugar in a separate bowl until smooth. Pour this mixture into the melted chocolate and stir until fully combined.
Combine the dry ingredients
Add the whey protein powder, cocoa powder, oat flour, and salt to the bowl. Fold gently until no dry patches remain. The batter should be thick but spreadable; if it feels stiff, loosen it with 1–2 tablespoons of milk or water.
Fill the tin
Scrape the batter into the prepared tin and spread it into an even layer, making sure it reaches the corners. The batter will look shallow in the tin, which is expected.
If you like to make them a little bit chocolatier, sprinkle a few chocolate chips over the top here.
Bake
Bake for 18–22 minutes, checking from the lower end of the range. The edges should be set and lightly pulling away from the sides, while the centre looks matte but still soft. A skewer inserted into the middle should come out with moist crumbs, not wet batter.
Cool completely
Remove from the oven and allow the brownies to cool fully in the tin. They will firm up as they cool; cutting too early will cause them to crumble and fall apart.
Slice and serve
Lift the brownies out using the paper overhang and cut into 16 squares with a sharp knife, wiping the blade between cuts for clean edges.
Storage, Freezing & Make-Ahead
These brownies keep well and are easy to make ahead. Store them in an airtight container in the fridge for up to 5 days; they slice best when chilled and soften slightly once brought to room temperature.
They also freeze very well. Wrap individual brownies tightly or store them in a sealed container and freeze for up to 3 months. Defrost at room temperature or overnight in the fridge — the texture holds up without drying out.
Because they’re dense and low-rise, they’re a good option for batch baking and portioning in advance.
Protein Brownies
Ingredients
- 00 g dark chocolate 70–85%, chopped
- 80 g butter
- 120 g skyr
- 2 large eggs
- 80 g brown sugar or coconut sugar
- 60 g whey protein powder neutral or chocolate
- 40 g cocoa powder
- 50 g oat flour or ground oats
- ½ tsp fine salt
- 75 g dark chocolate chips optional
Instructions
- Heat the oven to 170°C fan. Line a 23 × 23 cm tin with baking paper, leaving an overhang.
- In a bowl over a pan of simmering water, melt the dark chocolate and butter gently until smooth. Let it cool slightly.
- Whisk the skyr, eggs, and sugar until smooth, then stir into the melted chocolate until fully combined.
- Add the whey protein, cocoa, oat flour, and salt. Fold until no dry patches remain and the batter is thick but spreadable.
- Scrape into the tin and spread into an even layer. If using, top with the chocolate chips.
- Bake for 18–22 minutes until the edges are set and the centre looks matte but still soft. A skewer should come out with moist crumbs, not wet batter.
- Cool completely in the tin, then lift out and slice into 16 squares.
Notes
These brownies are designed to be low-rise and dense, with no baking powder or soda. If they look flat but have a fudgy centre and set edges, they’ve baked correctly. A taller result would require more batter or a smaller tin.
You can reduce the sugar slightly, but cutting it too much will affect both flavour and texture. Sugar helps balance bitterness from the cocoa and supports the soft, fudgy set. A reduction of 10–15 g is the safe limit.
Dry brownies usually mean they were baked too long. Pull them while the centre still looks soft and let them finish setting as they cool.
It’s also possible the protein powder was increased beyond the recipe. I have tried various quantities of protein powder and this is the maximum the batter can take before it becomes glaringly obvious that it’s in there.
Yes, they keep well. Store them in the fridge for up to five days or freeze for up to three months, tightly wrapped. Defrost at room temperature or overnight in the fridge for the best texture.
They’re best eaten cool or at room temperature, when the texture is dense and clean-cut. If serving warm, give them a few minutes out of the oven so they hold together rather than collapsing when sliced.
