1 c. sugar
3/4 c. butter
2 1/2 c. flour
1 c. sour cream
2 eggs
1 tsp. baking powder
1 tsp. baking soda
1 tsp. vanilla
1 (6 oz.) pkg. semi-sweet chocolate chips
1/2 c. light brown sugar
1 1/2 tsp. cocoa
1/2 c. chopped walnuts

Preheat oven to 350 degrees. Grease a 9 inch tube pan. In large bowl, beat sugar with 1/2 cup butter until light and fluffy. Use mixer at medium speed. Add 2 cups flour and next 5 ingredients. Beat at low speed until blended. Increase speed and beat 3 minutes. Stir in chocolate chips. Spread in pan.

In medium bowl, measure 1/2 cup flour, brown sugar, and cocoa. Using 2 knives, scissor fashion cut in 1/4 cup butter until mixture resembles coarse crumbs. Stir in walnuts and remaining chocolate chips. Crumble mixture evenly over batter in pan. Bake 60-65 minutes until cake pulls away from sides of pan. Cool completely, loosen and remove to a cake plate. Makes 8-10 servings.