To a large pot over medium-high heat, add oil.
When the oil is hot, add onion and cook for 5-7 minutes, or until translucent. Add garlic and cook for an additional minute.
Add in Italian sausage, ground beef, Italian seasoning, salt, and pepper. Cook, stirring occasionally and breaking up the meat as you go, for about 8-10 minutes, or until meat is no longer pink. Drain excess grease if necessary.
Pour in sauce, beef broth, and crushed tomatoes. Stir to combine and bring the soup to a simmer.
Once simmering, add lasagna and allow to cook for 8 minutes, or until the pasta is al dente.
Reduce heat to low. Add in heavy cream and cheeses, stirring until the cheeses are fully melted.
Garnish with parsley, parmesan cheese, and ricotta cheese, as desired. Serve.