Mix the dry ingredients

• Add the protein powder and cocoa powder to a mixing bowl
• Stir until evenly combined

Add the wet ingredients

• Add the peanut butter and maple syrup to the dry mixture
• Stir until a thick, fudgy dough forms

Shape the brownies

• Press the dough firmly into a lined loaf pan
• Smooth the top with the back of a spoon

Chill and slice

• Chill until firm
• Cut into squares and serve