STREUSEL:

1 c. brown sugar
1/2 c. chocolate chips
1/2 c. walnuts, chopped
2 tbsp. flour
2 tsp. cinnamon
2 tbsp. butter, melted

Mix all in small bowl and set aside.

COFFEE CAKE:

1 pkg. yellow cake mix
8 oz. sour cream
3/4 c. water
3 eggs

Combine all ingredients, mix well, beat 2 minutes at high speed. Spread 2/3 of batter in greased and floured 9x13 inch pan. Sprinkle half of streusel mixture over cake. Add rest of batter and sprinkle with rest of streusel. Bake at 350 degrees for 35-50 minutes. Serves 16.