Melt the butter then add the condensed milk and cocoa while stirring

Keep stirring on medium heat until thickened. You know when it is thick enough when the mixture does not immediately cover the bottom after stirring (around 10-15 min)

Let cool enough to handle with your hands

Prepare the topping in a bowl or plate

Grease your hands and shape small balls before rolling in the topping. Place in mini paper baking cups

Let cool in fridge before serving