1 box yellow cake mix
1/2 c. butter, softened
1 egg

Combine all ingredients in a bowl until crumbly. Press mixture into a greased and floured 12x9x2 inch baking pan. Cover with topping.

Topping:

1 (8 oz.) pkg. cream cheese softened
1 lb. pkg. powdered sugar
2 eggs
1 tsp. vanilla

Combine all ingredients in mixing bowl, mixing well. Pour over crust layer. Bake at 350 degrees for 50 to 60 minutes until golden brown. Let cool. Cut into bars.