Easy Starbucks Coffee Cake

Directions

1. 1
   Prepare cake mixe in large bowl according to directions on box. (cake mix, water, oil, and eggs).
2. 2
   Spray 9X13 pan with non-stick spray.
3. 3
   Pour batter into pan.
4. 4
   Bake at 350 degrees for 15-20 minutes or until center is just barely set.
5. 5
   While cake is baking, prepare crumb topping.
6. 6
   In large bowl of electric mixer combine, butter, flour, cinnamon, sugar and vanilla until all crumbly.
7. 7
   Immediately after cake is removed from oven, break crumb topping into marble size pieces with fingers, sprinkling over top.
8. 8
   Put back in oven and bake an additional 10-15 minutes (topping will begin to look a little less wet/raw).
9. 9
   Let cool fully then dust with powdered sugar, using a sieve.
10. 10
    Cut into squares and serve.