Chocolate and hazelnut muffins

I love to bake but find it terribly hard to control myself when I keep baked goods in the house, it is as if I cant walk by the kitchen without having another little sample. Lucky I have a job where I get to bake most days and that way get it all out of my system before I come home.
I do however still bake a lot at home, mainly before having guests, or if I am going to someone I can bring some fresh pastries. That way I can nearly pretend I am working and don't have to eat it all myself.
The other night though I just had a craving for something sweet to go with a cup of tea. After a look around in my cupboard I found some ground hazelnuts and decided to make some muffins. Hazelnuts are so delicious when toasted and added to cakes or muffins and goes really well with chocolate. So there it was; chocolate and hazelnut muffins. This make 8 normal sized muffins.

1 egg
75 grams butter
130 grams caster sugar
100 grams plain flour
30 grams ground hazelnuts
1.5tsp baking powder
75ml milk
1 1/2tsp cocoa powder

Melt butter and put aside to cool down. Combine flour, cocoa powder, hazelnuts and baking powder. Whisk egg and sugar until very fluffy and pale, add butter and stir until smooth. Add the dry ingredients through a sieve and fold in, last add milk and stir until all is well blended. Fill muffin cups to 2/3 and bake on 175C for 20min or until a skewer comes out dry. Let cool down.