Preheat the oven to 180°C (356°F).
Combine almond flour and cocoa powder in a bowl and mix.
Add erythritol, baking powder, and salt and mix well.
In another bowl, mix together the eggs, unsweetened milk, and vanilla extract thoroughly.
Combine the wet ingredients with the dry ingredients to make the dough.
Chop the dark chocolate finely and add it to the dough, mixing well.
Shape the dough into cookie shapes and place them on a baking tray.
Bake for 12 to 15 minutes in the oven.
Cool on a wire rack.