Crumb Cake
Directions:
Make cake mix according to directions. Spray baking dish with non-stick cooking spray. Bake at 350 F for 20 mins.
Mix together butter, flour, sugar, cinnamon, and vanilla until sticky. Break into crumbs, place on top of cake.
Bake cake an additional 20 mins.
Let cool. Dust with powdered sugar, cut into squares, and serve.