Preheat the oven to 180°C (356°F).
Add the eggs and erythritol to a bowl and mix well.
Add coconut flour, almond flour, baking powder, and salt, and mix until combined.
Add milk and melted butter, then stir until the dough is evenly mixed.
Shape the dough into small, bite-sized balls.
Line a baking pan with parchment paper and place the dough balls on top.
Bake at 180°C (356°F) for 15-18 minutes until golden brown.