Preheat oven to 180 degrees Celsius.

Break the dark chocolate into small pieces.

In a bowl, combine the peanut butter and butter.

Add both granulated sugar and powdered sugar and stir well until creamy.

Add milk and egg and mix until everything is evenly combined.

Add the flour and the baking powder and incorporate fully.

Gently fold in the chopped chocolate.

Form small balls of dough.

Place the dough balls on a baking sheet lined with parchment paper.

Press the dough down to flatten each cookie.

Bake for 10 minutes.

Turn off the oven and leave the cookies in the oven to cool for an additional 15 minutes.