Preheat the oven to 170°C (338°F).
In a bowl, mix almond flour, erythritol, and baking powder.
Add the egg, melted butter, and milk. Mix well.
Completely dissolve the gelatin in hot water.
Add the dissolved gelatin and vanilla extract to the dough and mix.
Shape the dough into balls and place them on a baking tray.
Bake in the oven at 170°C (338°F) for 13–15 minutes.
Let cool completely before serving.