Spoon cookie batter onto a parchment-lined cookie sheet (as 2 cookies) and use your spoon to shape them into circles.
Bake for 5 minutes, and check to see if they are firm. If not, check every minute. Be sure not to over-bake these cookies! Take them out as soon as they are firm.
Let cool.
Mix filling ingredients.
Turn over one cookie and spoon filling on top.
Cover with the other cookie, and enjoy!
Notes
This recipe works well with whey protein, and I wouldn't try substituting other types of protein powder in the cookie recipe.Feel free to use your own cream filling if there's something easier you have on hand!