Line a small baking dish or loaf pan with parchment paper. In a mixing bowl, combine the peanut butter, protein powder, and maple syrup or honey until a thick dough forms.

Press the mixture evenly into the prepared pan using a spatula or the back of a spoon so the base becomes compact and smooth.

Melt the dark chocolate chips in a microwave-safe bowl in short intervals, stirring until smooth.

Spread the melted chocolate evenly over the pressed protein base. Refrigerate for about 1 hour until firm, then slice into bars before serving.