Preheat oven to 325° F and line an 8×8 square pan with parchment paper or butter. Set aside.
Add whey protein, coconut flour, cocoa powder, and salt to a small bowl. Whisk well to combine.
Add eggs, almond butter, and sweetener to a large bowl or stand mixer. Mix on high until light and fluffy.
Slowly add dry ingredients to wet ingredients. Mix until smooth.
Pour batter into prepared pan and bake for 15-17 minutes, until the top is set but still soft. Allow them to cool before cutting into squares and serving.