The batter is pretty simple: * percent daily values are based on a 2,000 calorie diet. · beat 1/3 cup butter, confectioners sugar, milk, 1 1/2 teaspoons vanilla extract, and salt together in a bowl until smooth. The secret’s out: Then, you stir in sour cream and vanilla before adding the flour, baking soda, baking powder, and salt. It’s made by mixing together 1/2 cup of shortening (my mom always uses crisco baking sticks) with sugar and eggs. Your daily values may be higher or lower depending on your calorie needs.