2. Chop the onion and mince the garlic. Prepare cheeses and measure out spices and tomato products.
3. Heat olive oil in a skillet over medium heat. Add ground beef and Italian sausage, cooking until browned (6–8 minutes), seasoning lightly with salt and pepper.
4. Add chopped onion and sauté until softened (4–5 minutes).
5. Stir in minced garlic and cook until fragrant (30–60 seconds).
6. Add crushed tomatoes, tomato paste, sugar, basil, and oregano. Stir to combine and simmer uncovered for 20–25 minutes.
7. In a bowl, combine ricotta, egg, Parmesan, and parsley. Mix until smooth.
8. Cook lasagna noodles according to package instructions until al dente, then drain.
9. Grease a 9×13-inch baking dish. Spread a layer of meat sauce, then layer noodles, ricotta mixture, and mozzarella. Repeat layers ending with sauce on top.
10. Cover with foil and bake for 25 minutes; then remove foil and bake for another 20–25 minutes until golden.
11. Let the lasagna rest for 10–15 minutes before slicing and serving.