Rich Buttery Bars

1/2 cup cold butter or margarine
1 package yellow cake mix -- (18.25 oz)
1 egg -- beaten
Filling:
1 package cream cheese -- (8 oz) softened
2 cups confectioner's sugar
2 eggs
1 teaspoon vanilla extract
additional confectioner's sugar

In a bowl, cut butter into cake mix until crumbly. Add egg and mix well. Press into a greased 13-in. x 9-in. x 2-in. baking pan.

In a mixing bowl, beat cream cheese and sugar. Add eggs and vanilla; beat until smooth. Spread evenly over the crust.

Bake at 350� for 30 minutes. Reduce heat to 325�; bake 10 minutes longer. Dust with confectioners' sugar while warm.

Cool to room temperature before cutting.