Brownie Muffin

Preheat the oven to 160 °C (fan) and prepare a muffin tin with liners.

In a large bowl, thoroughly mix the flour, cocoa powder, chopped walnuts, grated chocolate, baking powder and baking soda.

In a second bowl, beat the egg, oil, sugar, buttermilk and drinking chocolate until frothy.

Add the flour mixture to the wet ingredients and fold in only until a smooth batter just forms.

Spoon the batter into the liners and bake the muffins for about 20–25 minutes.

Let the muffins rest for 5 minutes, then remove them from the liners and cool completely on a wire rack.