Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish—you don’t want to skip this.
Cook the ziti pasta according to package directions. Drain and set aside.
In a large skillet over medium heat, cook the ground beef with the onion until browned. Add garlic and cook for another 1-2 minutes.
Pour in the marinara sauce, sprinkle in Italian seasoning, season with salt and pepper, and let it simmer for 5 minutes.
In a bowl, mix together sour cream, ricotta, and 1 cup mozzarella. This is the creamy middle layer that gives the ziti its million-dollar magic.
Toss the cooked ziti with half the meat sauce. Layer half the pasta mixture into the baking dish, followed by the creamy cheese blend, then the remaining pasta and sauce.
Top with the remaining mozzarella and Parmesan.
Bake uncovered for 25–30 minutes, until bubbly and golden. Let it rest 10 minutes before digging in (or just accept you’ll burn your mouth. We’ve all done it).