Begin by placing a large skillet over medium heat and adding the ground round. Cook it while breaking it up with a wooden spoon until it’s no longer pink. You want a nice brown color without overcooking it.
Once cooked, add both cans of diced tomatoes and Rotel tomatoes along with the tomato paste, salt, sugar, Italian seasoning, and pepper. Stir everything well to combine. Let the mixture simmer over low heat while you prepare the other ingredients. This step will allow the flavors to meld beautifully.
Meanwhile, preheat your oven to 350 degrees Fahrenheit. While it’s heating up, cook the egg noodles according to the package instructions. Drain them well, ensuring they’re not too soft since they’ll continue cooking in the oven.
In a medium mixing bowl, stir together the cooked noodles, green onions, sour cream, and cream cheese. Mix until the ingredients are well combined and the noodles are coated.
Next, spoon the noodle mixture into a greased 13x9-inch baking dish, distributing it evenly across the bottom. This will form the base layer for your casserole.
Now, take the beef mixture from the skillet and spread it over the noodle layer gently. Be sure to cover the noodles completely with the savory meat sauce.
Sprinkle the shredded Cheddar, Parmesan, and mozzarella cheese generously over the top of the beef mixture. The cheese will melt into a glorious, bubbly topping that everyone will love.
To prepare for baking, spray a piece of aluminum foil with cooking spray and cover the baking dish with the foil, cooking spray side down. This will prevent the cheese from sticking.
Place the baking dish in the oven and bake for 35 minutes. The smell will be incredible! After that time, carefully remove the foil and let it bake uncovered for an additional 5 minutes until the cheese is golden and bubbly.
Once done, remove the casserole from the oven and let it sit for a few minutes before serving. This allows everything to set and makes it easier to cut into squares.