Preheat the oven to 350 degrees F (180 degrees C) and line a baking sheet with parchment paper.
Whisk together flour, cocoa powder and baking powder in a bowl until fully combined.
Mix in Greek yoghurt until you get a thick, sticky dough. Transfer to a piping bag and pipe small balls onto the prepared baking sheet.
Bake in the preheated oven for 12 minutes.
Brush with melted butter and coat with your favourite toppings.
