Preheat oven to 350 degrees F.
Grease & flour 9 x 13 inch pan.
Prepare the cake according to the directions on the package.
In medium bowl, combine ricotta, sugar & eggs. Mix until smooth.
Drop this mixture by spoonfuls on top of cake batter.
Bake for 1 hour or until toothpick inserted into the cake comes out clean.
Sprinkle cooled cake with confectioner’s sugar. Keep refrigerated.