Boston Creams

1/2 cup butter
1 1/2 cups granulated sugar
2 eggs
1 teaspoon vanilla extract
3 cups sifted all-purpose flour
1 teaspoon salt
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1 cup dairy sour cream

Cream butter and sugar to the consistency of mayonnaise, adding sugar gradually. Add eggs one at a time, beating after each addition. Add dry ingredients alternately with sour cream. Drop by heaping teaspoons onto a cookie sheet and flatten slightly. Bake at 400 degrees F for about 10 to 12 minutes.