A lady I went to church with, Janie, gave me this recipe.  It is very rich and delicious. 

6 Tablespoons melted butter
1 cup heavy cream

¼ pound + ¾ pound Mozzarella Cheese
2 Tablespoons + 6 Tablespoons freshly grated Parmesan cheese
1 Jar of Spaghetti sauce (26 oz)
1 pound of cooked ziti or penne pasta

 Melt the butter, heavy cream, ¼ pound of mozzarella, 2 T Parmesan together in large pan.  Once melted add spaghetti sauce and cooked pasta, mix together.

Pour mixture into greased baking dish, top with remaining cheese and bake at 400° for 10-15. 

You could make this ahead and put in fridge, but then you’d have to bake it longer.  Also, I have substituted whole milk for the heavy cream.  It’s not as rich and smooth but still so delicious.