Hi Phyllis. I don't know about Starbuck's coffee cake, I don't drink coffee. I am a bake-from-scratch person, this coffee cake recipe is the only one I make from cake mix. It is the most requested dessert I am asked to make for parties. Enjoy!

Preheat oven to 375°.

Prepare 1 package yellow cake mix according to the directions on the package. Pour into a greased 11x17 or 10x15 cookie sheet (I use the disposable aluminum ones). Bake 12 minutes at 375°.

Mix 2 packages of Betty Crocker pie crust mix (Jiffy or Pillsbury don't work well), 3 tblsp. soft butter, 2 tblsp. cinnamon and 1 cup white sugar. Add 1 tblsp. water, working in with a pastry blender. Mixture should be crumbly, not too dry and not too moist. Add more water, drop by drop, if mixture needs to be moister. Be careful not to add too much water, or you will have mush! Top partially baked cake with crumb muixture and bake an additional 15 minutes. Cool in pan. Dust with powdered sugar at serving time.

Keeps well for several days, but it never lasts very long at my house!