1. Preheat the oven to 350˚F (180°C). Grease a pizza pan (Ø 12.6 inches/32cm) or line with baking parchment and set aside.

2. In a large bowl mix the butter with sugar until light and fluffy. Add the egg and mix in well. Add the vanilla extract and mix in. In a second bowl, mix flour with baking powder and then add to the large bowl and mix in until just combined. Fold in the chocolate chips. Transfer the dough to the prepared cookie pizza pan and smooth out the top (works best with a spatula). Bake for 15-20 minutes – the cookie should get a nice golden color, but do not over-bake! It should still be a bit soft in the center. Take it out of the oven and let cool down completely.

3. Chop the chocolate coarsely and add to a bowl. Heat up the heavy cream in a small saucepan until small bubbles appear on the surface. Pour over the chopped chocolate and let sit for about 2-3 minutes, then stir until all is well combined and you have a nice smooth ganache. Pour over the cooled cookie – make sure you go to the edges of the cookie. Let cool down a bit, then cut 8 slices into the chocolate and decorate each slice with different sweets or chocolate pieces.