1 Duncan Hines deluxe yellow cake mix
1 tsp. baking powder
1 egg

Follow cake mix directions adding baking powder and the extra egg. Grease and flour a 13 x 18 inch baking pan. Bake 15 to 18 minutes in a 350 degree oven. Remove and cover with the following.

TOPPING:

4 c. flour
1 1/2 c. sugar
1 lb. butter
2 1/2 tbsp. cinnamon
2 1/2 tbsp. vanilla

Melt butter. Add flour, sugar, cinnamon and vanilla. Mix well and cool. Form crumbs on cake. Bake at 350 degrees for an additional 20 minutes until brown. Sift confectioners' sugar over top.