Grease a 14 x 11 inch pan and preheat the oven to 350 degrees.

CAKE:

1 box Duncan Hines yellow cake mix
1 1/3 c. water
3 eggs

CRUMB:

3 sticks butter
3 c. flour
1 c. sugar
Pinch of salt
2 tsp. cinnamon
2 1/2 tsp. vanilla extract

In a large bowl, beat cake mix, water and eggs until smooth. Pour batter into greased pan and bake 20 minutes or until center is firm. While cake is baking prepare crumb mixture. Melt butter and remove from heat. Add remainder of ingredients and mix to form crumbs. Sprinkle crumbs over the cake and rebake for 20 minutes or until brown. Sprinkle with confectioners sugar when cool.