Crust:

1 box Butter Recipe cake mix (yellow)
2/3 c. oil
2/3 c. water
4 eggs

Topping:

2/3 c. brown sugar
2/3 c. white (granulated) sugar
1 tbsp. cinnamon
4 c. flour
3 sticks butter, melted
1 tbsp. vanilla
powdered sugar

Mix cake ingredients and pour into large greased jelly roll pan.

Bake at 350°F for 20 minutes. While cake is baking, make topping by mixing all topping ingredients together. Crumble over top of cake and bake an additional 20 minutes. Sprinkle with powdered sugar when cool.