Grease and flour jelly roll pan.
1 box yellow cake mix
Prepare batter according to box directions. Spread onto jelly roll pan and bake at 350 degrees for 20 minutes.
Crumbs:
3 sticks of melted margarine
1 c. sugar
3 cups flour
2 tsp. vanilla extract
2 tsp. cinnamon
Mix well and crumble over hot cake. Bake again at 350 degrees for 45 minutes. Sprinkle confectionery sugar over cake when cooled. For thicker crumbs, double crumb recipe.