1 Betty Crocker Yellow Cake box mix, prepared according to box directions and also add 1 teaspoon vanilla
1 pound salted butter
4 cups flour
2 cups sugar
2 Tablespoons cinnamon
1-Prepare the cake as package directs and add vanilla.
2-Bake it in a 9×13 pan lined with nonstick foil for 15-20 minutes at 350.
3-Electric mix butter, flour, sugar and cinnamon to make crumbs.
4-Sprinkle all over the cake and return to the oven for an additional 15-20 minutes.
5-Let cool completely before cutting.