Prep your pan and oven. Heat the oven to 350°F (175°C). Line an 8x8-inch (20x20 cm) pan with parchment and lightly grease it. This helps the brownies release cleanly and keeps edges from sticking.

Mix dry ingredients. In a large bowl, whisk almond flour, cocoa powder, protein powder, sweetener, baking powder, and salt until no lumps remain. Breaking up cocoa and protein clumps now prevents overmixing later.

Whisk wet ingredients. In another bowl, whisk eggs, yogurt, almond milk, vanilla, melted coconut oil, and almond butter until smooth. If your nut butter is stiff, warm it slightly so it incorporates easily.

Combine gently. Pour wet into dry and fold with a spatula until just combined. The batter will be thick. If it looks dry or crumbly, add 1–2 tablespoons more almond milk to loosen it slightly.

Add extras. Fold in sugar-free chocolate chips if using. They help with that classic brownie bite and meltiness.

Spread and smooth. Transfer batter to the prepared pan and spread it evenly into the corners. A damp spatula helps smooth the top.

Bake. Bake for 18–24 minutes, depending on your oven and protein powder type. You’re looking for set edges and a slightly soft center. A toothpick should come out with a few moist crumbs, not wet batter.

Cool completely. This is key. Let the pan cool on a rack for at least 30–45 minutes. Protein brownies firm up as they cool and slice much cleaner.

Slice and serve. Cut into 9–12 squares. For extra fudginess, chill them for an hour before slicing.