I just found this recipe, it looks delicious!

Old Fashioned Crumb Cake

Prep Time: 15 minutes

Cook Time: 40 minutes

Total Time: 55 minutes
Ingredients:

For the Cake:
1 box Pillsbury yellow cake mix
3 eggs
1 cup water

For the Topping:
2 sticks margarine
2 sticks butter
1 1/2 teaspoons vanilla
3/4 teaspoon almond extract
5 1/3 cup flour
2/3 cup plus 1/4 cup brown sugar
2/3 cup plus 1/4 cup sugar
1 tablespoon cinnamon
1/2-3/4 cup confectioners sugar
Directions:

For the Cake:
Preheat oven to 325*F. Spray a jelly roll pan with Baker's Joy (or butter and grease it). Add cake mix, eggs, and water to the bowl of a stand mixer fitted with the paddle attachment (may also use bowl and hand mixer). Beat for 4 minutes. Pour into prepared jelly roll pan, and smooth with a spatula. Bake at 325 for 20-25 minutes (remove from oven when done, but leave oven on). While it's baking, prepare crumb topping.

For the Topping:
Microwave butter and margarine in a bowl until melted (whisk together). Allow to cool and then add vanilla and almond extracts. In a large bowl, mix together the flour, sugars, and cinnamon. Cut the butter mixture into the flour mixture using a pastry cutter (or two forks) until a crumbly mixture. Sprinkle the crumb topping onto the cake and bake for an additional 20-25 minutes at 325*F. Allow to cool completely and then sift with confectioners sugar before serving.