Preheat the oven to 180°C.
In a bowl, mix almond flour, cocoa powder, and baking powder.
In another bowl, combine egg, unsweetened almond milk, erythritol, and vanilla extract, and mix well.
Add the dry ingredients to the wet ingredients and mix until it forms a dough.
Chop sugar-free dark chocolate and mix it into the dough.
Divide the dough into small portions and place them on a baking sheet.
Bake in the oven at 180°C for 10–12 minutes.
Let the cookies cool on a wire rack.