Warm a big pot or Dutch oven on medium heat.
Add minced beef or Italian sausage and cook until it turns brown, breaking it into small pieces while cooking. Remove extra grease.
Add chopped onion and garlic to the mixture. Cook until they are soft and smell good (around 2-3 minutes).
Put the crushed tomatoes, diced tomatoes, broth, Italian seasoning, basil, oregano, red pepper flakes, salt, and pepper into the mixture.
Heat until boiling, then lower the temperature to a gentle simmer. Put a lid on the pot and cook the soup for 15-20 minutes so the flavors mix well.
Put the torn lasagna noodles into the soup that is gently boiling.
Cook the noodles until they are soft, stirring occasionally to avoid them sticking (around 8-10 minutes).
In a little bowl, combine ricotta cheese, shredded mozzarella, and grated Parmesan cheese.
Pour the hot soup into bowls.
Put a big spoonful of the cheese mixture on top of each bowl.
Add some fresh parsley or basil on top as decoration, if you like.
