Preheat oven 400°F.
Line a cookie sheet with parchment paper, set aside.
In a medium mixing bowl, combine softened butter, cream cheese, erythritol, and stevia. Mix together until smooth.
Beat eggs into cream cheese mixture.
In a separate bowl, combine almond flour, coconut flour, protein powder, and baking powder. Mix together.
Add dry ingredients to wet ingredients. Beat together until well incorporated.
Add emulsion and vanilla. Mix well.
Fold in walnuts.
Drop spoonfuls of cookie dough on the parchment lined cookie sheet.
Leave an inch or two between each cookie.
Bake for 10-12 minutes or until the cookie starts to brown slightly on top.
Let cool completely before removing from cookie sheet.
Store in an airtight container in the refrigerator.
Yields: 18 cookies