Bring a large pot of salted water to a rolling boil, then add 1 pound of ziti pasta. Cook it al dente according to package directions, usually about 9-11 minutes.
In a medium saucepan, combine 24 oz of marinara sauce, 1 cup of heavy cream, and 15 oz of diced tomatoes. Stir in 1 teaspoon of sugar if desired. Simmer over medium heat for 10-12 minutes.
Remove the sauce from the heat and add ¾ cup of parmesan cheese blend, ½ cup of fontina cheese, and ½ cup of mozzarella cheese. Stir until melted.
In a 9x13 inch baking dish, layer half of the cooked ziti pasta on the bottom.
Pour the creamy cheese sauce over the pasta, ensuring even distribution.
Top the sauced pasta with 1 cup of mozzarella cheese and ¼ cup of parmesan cheese.
Sprinkle breadcrumbs over the cheese layer.
Broil for about 3-5 minutes, or until the cheese is bubbling and golden-brown.
If preparing as a casserole, cover the baking dish with foil and bake at 350°F for 30-45 minutes, removing the foil for the last 10 minutes.
To freeze, cool completely before wrapping. Thaw overnight in the fridge and bake covered at 350°F for 45-60 minutes.