Cream together the softened butter and powdered sweetener in a large mixing bowl for about 2-3 minutes until smooth and fluffy.

Add the eggs and vanilla extract, mixing until fully combined.

Whisk together the almond flour, coconut flour, baking powder, and salt in a separate bowl.

Gradually add the dry ingredients to the wet mixture, stirring gently until incorporated.

Using a cookie scoop, portion out the dough onto a lined baking sheet, spacing them 2 inches apart.

Preheat the oven to 350°F (175°C) and bake for 7-9 minutes until lightly golden.

Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack.

Prepare the frosting by mixing together the softened butter and powdered sweetener until creamy, adding food coloring if desired.

Spread frosting on cooled cookies.