3 c. flour
3 tsp. baking powder
1 tsp. baking soda
1 tsp. salt
1 c. butter
1 c. sugar
3 eggs
1 c. sour cream

Preheat oven to 350 degrees. Combine flour, baking powder, baking soda and salt, set aside. In bowl combine butter and sugar, beat until creamy. Add eggs, one at a time, beating thoroughly after each addition. Add flour mixture alternately with sour cream.

TOPPING:

2 (6 oz.) pkg. semi sweet chocolate pieces
1/2 c. firmly packed brown sugar
1 tsp. cinnamon

Combine semi sweet chocolate pieces, brown sugar and cinnamon, mix. Spoon half of cake batter into greased pan, 13 x 9 x 1 inch. Sprinkle with 3/4 topping mixture. Cover rest of batter, then sprinkle with remaining topping. Bake at 350 degrees for 45 minutes.