Preheat oven to 375°F (190°C). Cook pasta according to package directions until al dente. Drain.
Heat large skillet over medium-high heat. Add ground beef and Italian sausage, cook until browned. Drain grease.
Add onion to skillet, cook until softened (5 mins). Add garlic, cook until fragrant (1 min). Stir in crushed tomatoes, tomato sauce, tomato paste, Italian seasoning, sugar, salt, and pepper. Simmer for 15 minutes.
In a large bowl, combine cooked pasta and meat sauce.
Pour half of pasta mixture into 9x13 inch baking dish. Dollop half of ricotta over pasta. Sprinkle with half of mozzarella and Parmesan.
Repeat layers with remaining pasta, ricotta, mozzarella, and Parmesan.
Cover with foil and bake for 20 minutes. Remove foil, bake for 10-15 minutes until cheese is melted and bubbly. Internal temperature should reach 165°F.
Rest for 10-15 minutes before serving. Garnish with parsley.