Heavenly Walnut Chocolate Dessert

Ingredients
For the Base:

120 g walnuts (4.2 oz), cut into small pieces
400 g cookies (14 oz), crushed
120 g sugar (0.6 cup)
2 g vanilla sugar (0.5 teaspoon)
60 g cocoa powder (0.5 cup)
250 ml milk (1.25 cup)
150 g butter (5.3 oz)
For the Top Layer:

20 g walnuts (0.7 oz), chopped
100 g milk chocolate (or dark chocolate if desired) (3.5 oz), chopped
100 ml cream with 33%-35% fat content (0.5 cup)
Directions

Prepare the Base:
Crush the cookies into small pieces and place them in a large mixing bowl.
Add the 120 g of chopped walnuts to the crushed cookies.