Preheat oven to 350 degrees.

1 box cake mix
1 disposable cookie sheet

CRUMBS:

4 c. flour
1 1/3 c. sugar
3 tsp. vanilla
3 tsp. cinnamon
Pinch salt
1 lb. butter (not light)

Bake cake until top of cake is light brown, approximately 15-20 minutes. Take cake out of oven.

Melt butter. Combine all ingredients. Mix until becomes crumbly. Place crumbs onto cake. Put cake back into oven until top of crumbs become brown. Turn off oven, leave cake in oven, open oven door. Remove when oven has cooled off. Sprinkle with powdered sugar.