Blueberry Cup Cakes

1/2 cup butter
1 1/4 cup sugar
2 eggs slightly beaten
2 cups flour
2 teaspoons baking powder
2/3 cup milk
1 tsp. vanilla
1 pint blueberries

Cream butter, sugar, add eggs. Then add rest of ingredients except blueberries.
Blend for two minutes.
Add blueberries.
Pour into greased and floured cupcake tins, or paper cups.
Sprinkle top of batter with sugar.
Bake in 350 degree oven for thirty minutes or until cupcakes spring back at the touch and are browned.