Preheat the oven to 180°C (356°F).
In a bowl, mix almond flour, coconut flour, baking powder, and salt.
Add eggs, melted unsalted butter, erythritol, unsweetened matcha powder, and milk to make the dough.
Chop the low-sugar dark chocolate into small pieces and mix into the dough.
Shape the dough into rounds and place them on a baking pan.
Bake in the oven at 180°C (356°F) for 20 minutes.
Let cool before serving.