Twila's Italian Love Cake

1 pkg chocolate cake mix
2 lbs ricotta cheese
3/4 c sugar
3 eggs
1 tsp vanilla
Frosting:
1 small box choc. instant pudding
1 c milk
1 8 oz cool whip
Oven 350°. Prepare cake as directed.
Put into greased and floured pan 13 x 9
Mix sugar, eggs, cheese and vanilla until smooth.
Pour over cake batter.
Bake 1 hour.
Frost when cool.