Bring tomatoes and tomato paste to a simmer. Add water to take it to the consistency you desire (I like mine on the thick side)
Cook tortellini according to package instructions. DO NOT OVERCOOK. Just a little hint – you really don’t need to stir while they are cooking, and most usually take 2-3 minutes tops.
In the bottom of a casserole dish (I recommend a rectangular one), spread 1/4 cup of your tomato sauce then layer 1/2 of the tortellini followed by more tomato sauce and a layer of mozzarella cubes.
Before adding the second layer of tortellini, mix the cream and parmesan in a bowl and pour over the first layer.
Repeat layers, using the rest of your ingredients and finishing off the top with the cubed mozzarella.
Cook at 400 degrees for 25-30 minutes or until mozzarella begins to brown.
Serve with a sprinkle of Italian seasoning. Enjoy!