Chocolate Sockerkaka

Name: Chocolate Sockerkaka
Cuisine: American
Ingredients: 100g (¼ cup + 3 tbsp) butter (melted); 60ml (¼ cup) milk; 50ml (3 tbsp) strong brewed coffee (cold); 2 eggs (small); 150g (¾ cup) sugar; 135g (1 cup + 1 tbsp) spelt flour (see note 2); 30g (¼ cup) cocoa; 1 tsp baking powder; 1 tsp vanilla sugar (see note 1); 50g (1¾ oz) white chocolate (melted); Maltesers, nuts or anything else you want to sprinkle over (optional)