Sour Cream Chocolate Chip Cake

My family's go-to birthday cake.

Ingredients

• ¾ cup margarine
• 1 ½ cups sugar
• 4 egg yolks
• 2 ½ cups flour
• 1 ½ teaspoon baking soda
• 1 ½ teaspoon baking powder
• 1 ½ cups sour cream
• 4 egg whites, beaten stiff
• 12 ounce package semi-sweet chocolate chips
• 1 ⅛ cups margarine
• 4 ½ cups powdered sugar
• 2 ¼ tablespoons cocoa
• 2 ¼ tablespoons milk
• 2 ¼ tablespoons vanilla

Directions

1. Cream together the margarine and sugar.
2. Add the egg yolks, one at a time, mixing well.
3. Add flour, soda, baking powder, salt and sour cream. Mix well.
4. Fold in the chocolate chips and the stiffly beaten egg whites.
5. Bake in 3 greased and floured 9” cake pans at 325°F for 30 minutes. Cool in pans on cooling rack for 10-15 minutes. Remove from pans and invert on cooling rack to finish cooling.
6. To make frosting, cream margarine. Add other ingredients and blend until smooth.