Bottom layer:

1 yellow cake mix
1/2 c. butter, melted
1 egg
1/2 to 3/4 c. pecans (optional)

Mix together in a mixing bowl with a fork and press into a buttered 9 x 13 inch pan.

Top layer:

1 (8 oz.) pkg. cream cheese
1 (1 lb.) box powdered sugar (4 c.)
2 eggs

Mix together with an electric mixer until batter is smooth. Pour over bottom layer. Bake at 350 degrees for 30 to 35 minutes. Dust with powdered sugar when cool.