In a bowl, lightly melt the butter until warm.
Add the cocoa powder and mix well until combined.
Incorporate the white sugar and brown sugar, mixing until well combined.
Add the egg and vanilla extract, beating until you obtain a homogeneous mixture.
Add the flour, baking powder, a pinch of salt, the chocolate chips, the chopped chocolate, and the white chocolate chips. Mix well.
Refrigerate the dough for at least 1 hour.
Preheat the oven to 350°F (180°C).
Line a baking sheet with parchment paper.
Using a #20 ice cream scoop, form dough balls and place them on the baking sheet, keeping them spaced apart.
Bake for approximately 14 minutes.
After removing from the oven, use a metal ring to shape them into a round form.
Let them cool on the baking sheet before handling.