Mix yellow box cake (Duncan Hines) as directed on box and put in greased and floured 9 x 13 inch pan.

In bowl mix:

1 16oz container ricotta
3/4 c. sugar
4 eggs
2 tsp. vanilla

Spoon mixture evenly on top of cake. Bake in 350 degree oven 45-50 minutes. Be sure center of cake is done.