Preheat oven to 350 degrees. Prepare cake mix as directed. Pour into greased and flour cake pan. Mix ricotta, sugar, eggs and vanilla until smooth. Pour cheese mixture on top of cake batter. Bake at 350 degrees for one hour. Let cool before frosting.
1 small box instant pudding mix 1 cup milk 1 (8 ounce) container cool whip
Mix the above ingredients together and then spread onto cooled cake.