Mix coconut flour, almond flour, baking powder, baking soda (1g), and salt until there are no lumps.
Whip peanut butter and room temperature butter together until it reaches a mayonnaise-like texture.
Cream the butter mixture with sweetener, then add the egg and vanilla extract and whip.
Add the dry ingredients to the butter mixture and fold in using a spatula.
Add chocolate chips.
Preheat oven to 180°C and bake for 10 minutes.
Cool on the pan for 10 minutes, then transfer to a wire rack.