Apple Crumb Bars

STEP 1
Preheat oven to 350°F. Set aside 1 cup Krusteaz Fat Free Apple Cinnamon Muffin Mix.
STEP 2
Using an electric mixer, blend remaining Krusteaz Fat Free Apple Cinnamon Muffin Mix, yogurt and egg whites on low speed until crumbly. Press mixture into bottom and sides of lightly greased 8x8x2-inch pan. Pour apple filling over crust. Add margarine to remaining Krusteaz Fat Free Apple Cinnamon Muffin Mix, and blend with fork until crumbly. Top apple filling with crumbled mixture.
STEP 3
Bake 20-25 minutes or until golden brown.