Easy Homemade Lasagna

Name: Easy Homemade Lasagna
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: Italian
Ingredients: 12 lasagna noodles (uncooked); 4 cups shredded mozzarella cheese (divided); ½ cup shredded Parmesan cheese (shredded and divided); ¾ teaspoon salt (more to taste); ½ pound lean ground beef; ½ pound Italian sausage; 1 yellow onion (diced); 2 cloves garlic (minced); 36 ounces pasta sauce (*see note); 2 tablespoons tomato paste; 1 teaspoon Italian seasoning; 2 cups ricotta cheese (or cottage cheese); ¼ cup chopped fresh parsley; 1 large egg (beaten)