Preheat Oven: Set your oven to 350°F (175°C) and line a baking sheet with parchment paper.
Cream Butter and Sweetener: In a mixing bowl, beat the softened butter with erythritol until light and fluffy.
Add Wet Ingredients: Mix in the egg and vanilla extract until fully combined.
Add Dry Ingredients: Slowly add almond flour, coconut flour, baking powder, and salt. Mix until a soft dough forms.
Chill Dough (Optional): For easier shaping, chill the dough in the fridge for 10–15 minutes.
Shape Cookies: Roll the dough into balls or use cookie cutters to create festive shapes.
Bake: Place cookies on the prepared baking sheet and bake for 10–12 minutes, or until the edges are golden.
Cool: Let cookies rest on the baking sheet for 5 minutes, then transfer to a cooling rack.
Decorate (Optional): Once cooled, decorate with keto-friendly icing or sprinkles.