Preheat the oven: Set your oven to 350°F (175°C) and line an 8x8-inch baking pan with parchment paper.
Blend the cottage cheese: Blend the cottage cheese until smooth if it's not already creamy.
Melt the coconut oil: Melt the coconut oil and set it aside to cool slightly.
Mix the dry ingredients: In a bowl, whisk together cocoa powder, protein powder, coconut flour, baking powder, and sweetener.
Combine the wet ingredients: In a separate bowl, whisk together eggs, cottage cheese, vanilla extract, and melted coconut oil until smooth.
Make the batter: Gradually add the dry ingredients to the wet mixture, stirring until smooth. Fold in chocolate chips if desired.
Bake the brownies: Pour the batter into the prepared pan, spreading it evenly. Bake at 350°F (175°C) for 18-22 minutes, or until the edges are set, and the center is slightly soft.