1 box yellow cake mix (also ingredients from the back of the box, i.e., oil, eggs, etc.)
3 sticks butter or margarine
3 cups flour
1 1/2 tablespoons cinnamon
3/4 cup sugar
1 tsp salt
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Let's Make It
Make yellow cake following the directions on the back of the box. Pour into 11x15 pan and bake at 325°F for 25 minutes.
While that is baking, make the topping. Put the butter, flour, cinnamon, sugar, and salt into a bowl and mix them with your hands. It should be a crumbly mixture. Store in the freezer until the time for the cake is up. (This is just so the mixture sets up a little. It is not a necessary step.)
After the cake has been in the oven for 25 minutes, crumble the topping over the entire thing. Put the cake back in the oven for 15 minutes, or until a toothpick stuck in the center comes out clean. After it has cooled, sprinkle the top with powdered sugar.