1 pkg. yellow cake mix
1 lb. butter, softened
4 c. flour
2 tsp. vanilla
1 1/3 c. sugar
4 tsp. cinnamon
Powdered sugar

Preheat oven to 325 degrees. Spray Pam in jelly roll pan or large baking pan. Make cake as directed. Bake for 15 minutes in jelly roll pan. While cake is baking, mix vanilla with softened butter. Add flour, sugar, and cinnamon. Mix with fork or fingers to form crumbs. Remove cake from oven. Sprinkle with crumb mixture. Bake for an additional 15-20 minutes. Last minute or two of baking, turn oven to broil to brown crumbs. Watch carefully! When cool sprinkle top with powdered sugar.