In a large, deep skillet over medium-high heat, add ground beef and sausage then cook until mostly brown. Add onion and garlic then continue cooking until until meat is fully browned.
Add crushed tomatoes, tomato sauce, tomato paste, sugar, Italian seasoning, basil, fennel, 1 tablespoon salt, and pepper. Stir to combine, reduce heat to low, cover and simmer for one hour.
Add all but 2 tablespoons chopped parsley to sauce. Stir. Taste and add more salt if needed. Remove from heat.
Preheat oven to 375° F.
In a medium-sized bowl, combine ricotta, egg, 1/2 teaspoon salt, and remaining fresh parsley.
To assemble, spray a 9x13 pan with cooking spray then ladle in enough sauce to coat bottom of dish. Add 4-6 pieces of lasagna over sauce (it's ok if they overlap a little). Add 1/3 of ricotta mixture then carefully spread across pasta. Sprinkle with 1/3 of the mozzarella, 1/3 of meat sauce then 1/3 of the Parmesan. Repeat layers two more times ending in sauce and remaining cheese.
Cover tightly with nonstick foil (or spray regular foil with cooking spray). Bake in preheated oven for 25 minutes. Remove foil and cook for 20-25 additional minutes. Let sit for 10-15 minutes before serving.