1 c. sugar
1/2 c. butter
2 c. flour
1 c. sour cream
2 eggs
1 tsp. baking powder
1 tsp. baking soda
1 tsp. vanilla
1/2 c. chocolate chips

Preheat oven to 350 degrees. Grease a 10-inch tube pan. Beat sugar and butter until light. Add flour, sour cream, eggs, baking powder, baking soda, and vanilla. Blend and beat 3 minutes. Stir in chocolate chips. Pour into prepared pan.

TOPPING:

1/2 c. flour
1/2 c. packed brown sugar
1 1/2 tsp. cocoa
1/4 c. butter
1/2 c. chopped walnuts
1/2 c. chocolate chips

Combine flour, brown sugar, and cocoa. Cut in butter and blend until crumbly. Stir in walnuts and chocolate chips and sprinkle on top of cake batter. Bake for 55 to 60 minutes; cool, and place on plate with topping side up.