Mix peanut butter and egg whites until combined and smooth.
¼ cup natural peanut butter, 2 large egg whites
Add powdered peanut butter, baking powder, and stevia. Mix well, using your hands if necessary.
½ cup powdered peanut butter, 1 teaspoon baking powder, 4 mini-scoops stevia powder
Roll cookie dough into 12 balls, and place on a parchment-lined cookie sheet.
Using your thumb or the back of a teaspoon measuring spoon, press into each cookie.
Bake for about 10 minutes, until cooked and firm.
Let cool.
Mix chocolate whey with just enough water to get an icing consistency.
¼ cup chocolate whey protein powder, 1 ½ tablespoons filtered water
Spoon into each cookie cavity.
Enjoy! Store in the refrigerator.
Notes
Powdered peanut butter gives these protein cookies an extra flavor boost! If you would like to sub a different protein powder there, I suggest using a plant-based protein (pea protein blend). For the center, I don't recommend using a different type of protein powder. For a vegan filling, I suggest making a vegan chocolate ganache.