Combine the baking powder, almond flour, coconut flour, and sweetener together in a medium bowl. Stir until well-combined.
Mix the butter, vanilla, and egg into the bowl. Knead with your hands to obtain consistency in the pasty mixture.
Add the almond slices and some chocolate chips into the dough. If the mixture is still sticky, add more almond flour as necessary. Alternatively, you can cool the mixture in the refrigerator for an hour for easy molding of the cookie balls.
Make 16-20 balls out of the dough. Arrange them neatly on the baking sheet. Set the oven to 300°F and place the sheet in for 20 minutes.
Take out from the oven once golden brown. Let stand to cool for a few minutes then serve.