Combine almond flour, coconut flour, egg white protein powder, gelatin, and salt into a bowl and whisk to combine all ingredients evenly.
In a mixing bowl, beat butter, cream cheese, and Allulose until creamy (about 5 minutes)
Add in the egg, lemon juice, and vanilla. Mix just until combined
Add dry ingredients and mix just until combined.
Form the dough into a ball and wrap it in plastic wrap. Store in the refrigerator for at least 2 hours but 12 hours gives the best texture. (Can be frozen up to a month)
When the dough is ready, preheat the oven to 375℉
Form into 1-inch balls and flatten slightly on a lined baking sheet. Bake 12-14 minutes or until you see the edges begin to turn a darker shade but not brown.
Remove from oven, if you like perfectly circle cookies, take a circle cookie cutter that is larger than the cookies and swirl around to achieve a perfect circle. Allow to cool for at least 30 minutes before frosting.