Preheat the oven to 400°F. Bring a large pot of salted water to a boil and prepare a 9×13-inch baking dish.
Add the marinara sauce to a saucepan or pot over medium-low heat. Stir in the Alfredo sauce, ricotta, and Italian cheese blend.
Continue stirring until the cheeses have melted into the sauce and the mixture is as smooth as possible.
Taste the sauce and add salt as needed. The amount will depend on the sodium in the jarred sauces and cheese.
Cook the ziti in the salted water until al dente, then drain.
Immediately add the hot drained ziti to the sauce and toss until evenly coated.
Transfer the pasta and sauce to the 9×13-inch baking dish.
Spread the shredded mozzarella evenly over the top.
Mix the Italian breadcrumbs with the melted butter and sprinkle the mixture over the mozzarella.
Bake for 15 minutes, until the mozzarella is melted and the breadcrumbs have begun to brown.
Allow the ziti to cool briefly before serving.