Mix the butter and peanut butter together until smooth. Add sugar, brown cane sugar and 1 teaspoon vanilla sugar and stir in. Add the egg and stir until frothy. Pour flour over it and keep stirring. Stir in the dark chocolate.
Put the dough in heaps with a teaspoon on a baking sheet (leave a space as it will melt).
Preheat the oven to 180 ° (top and bottom heat) and bake the cookies for 10-15 minutes (depending on the oven). As soon as they turn brown, take them out and let them cool down.