Ingredients: 150 gm icing sugar-sifted
3/4 cup butter
1 cup cocoa powder
1 tsp vanilla essence
1/2 cup milk powder
milk, in case required
Method: Mix all the ingredients into a dough like consistency, using milk only if mixture is too dry. Shape and leave to dry till outer layer is dry enough to handle. Wrap in paper and store.
If you want to add liquer add it to mixture while mixing (a tablespoon of the liquer of your choice).
The cake tin should never be more than half full. Maybe that is what you are doing. If the batter is too much, divide it into two and bake one at a time if they not fit into the oven together.