Steps
1 beat the butter well with the sugar 5 minutes
2 stir the eggs to the previous mixes
3 continue beating at least another 5 minutes
4 mix the baking powder with the wheat flour in a dry bowl
5 pour the liquid milk to the sugar butter and egg mixture
6 gradually mixing the mixture of baking powder and wheat flour into the mixture of butter, sugar, egg and milk
until it is at the correct point (not so thick or liquid)