01 -
Heat olive oil in a pot over medium heat. Add diced onion and minced garlic, sauté until softened. Add Italian sausage and ground beef; cook until browned. Drain excess fat, retaining a small amount for moisture and flavor.
02 -
Add whole tomatoes with juice, tomato sauce, Italian seasoning, red pepper flakes, salt, and pepper to the pot. Stir well and simmer for 25 to 30 minutes. Remove 3 to 4 cups of sauce to a separate bowl and allow to cool.
03 -
Preheat the oven to 375°F (190°C).
04 -
In a bowl, combine ricotta cheese, 2 cups grated mozzarella, grated Parmesan, egg, salt, and pepper. Stir gently just a few times to maintain some texture.
05 -
Drain cooked pasta and rinse under cool water to halt cooking. Add pasta to the cheese mixture and toss lightly to combine, leaving some cheese lumps intact. Add the cooled meat sauce and toss gently to blend.
06 -
Spread half of the pasta mixture into a large casserole dish. Top with half of the remaining sauce and half of the remaining grated mozzarella cheese. Repeat with the remaining pasta, sauce, and mozzarella.
07 -
Bake in the preheated oven until bubbling and cheese is melted, about 20 minutes. Remove from oven and let stand 5 minutes before serving. Sprinkle with freshly chopped parsley.