Prepare Sauce: Heat a large skillet over medium heat and add a splash of olive oil. Brown the ground beef and Italian sausage for about 8-10 minutes until fully cooked, draining excess fat. Sauté the onion and garlic in the same skillet until translucent, about 3-4 minutes. Stir in crushed tomatoes, tomato paste, sugar, dried basil, salt, and black pepper; simmer for 30 minutes.

Cook Noodles: While the sauce simmers, bring a large pot of salted water to a boil. Cook lasagna noodles according to package instructions until al dente, usually around 8-10 minutes, then drain and set aside.

Preheat Oven: Preheat your oven to 375°F (190°C) to get it ready for baking your lasagna.

Layer Ingredients: In a 9x13 inch baking dish, spread a thin layer of the meat sauce on the bottom. Place 4 noodles over the sauce, then spread half of the ricotta mixture on top. Continue layering with more meat sauce and noodles, finishing with a layer of meat sauce and the remaining mozzarella.

Bake: Cover the baking dish tightly with aluminum foil and bake in the preheated oven for 25 minutes. Uncover and bake for an additional 25 minutes, or until the cheese is bubbly and golden brown.

Rest and Serve: Remove the lasagna from the oven and let it cool for 10-15 minutes. Garnish with parsley, slice into servings, and enjoy.