Heat a large, 4-5 quart pot over medium-high heat. Add sausage, ground beef, onion and garlic. Cook, stirring often, until meat is no longer pink. Drain any excess grease from the pan.
Add basil, oregano, bay leaves and crushed red pepper flakes. Stir and cook for about 1 minute.
Add marinara to the pot and stir to combine. Bring to a boil, then cover and turn the heat down to low. Simmer for 20-30 minutes. Stir in a couple tablespoons of freshly minced parsley.
About 15 minutes prior to finishing the sauce, bring a large pot of water to boil. Add a tablespoon of salt and the pasta. Cook pasta according to package directions. Reserve ½ cup pasta water before draining.
Once the pasta is cooked to al dente (cooked, but with a bite) add the pasta directly to the sauce and stir/toss to coat. Serve immediately with fresh basil and parmesan cheese for garnish.