2 c. sugar
1 c. butter
3 1/2 c. cake flour
1 c. milk
1 1/2 tsp. baking powder
2 tsp. vanilla extract
1/4 tsp. salt
4 eggs
1/4 c. cocoa

Grease 10" tube pan. In large bowl with mixer at low speed beat sugar and butter until blended. Increase speed to high, beat until light and fluffy. Add flour and remaining ingredients except cocoa at low speed until well mixed. Increase speed and beat 4 minutes longer. Preheat oven to 350 degrees. Remove 2 1/2 cups batter into bowl. Add cocoa, beat with wire whisk. Alternately spoon vanilla and chocolate batters into pan. With large spoon cut and twist through batters to obtain marble effect. Bake 1 hour. Cool cake in pan on wire rack for 10 minutes. With spatula loosen cake edge from pan. Remove cake. Cool completely on rack. Sprinkle powdered sugar on top.