Rich, hearty, and loaded with savory beef, Italian sausage, and tomatoes, this homemade sauce is an easy family favorite that lets your slow cooker do the work!
Spray the inside of a crockpot with cooking spray (or insert a crockpot liner).
In a large skillet over medium heat, brown the beef and sausage with the frozen onions and peppers until the meat is fully cooked and most of the moisture has evaporated.
Add the minced garlic, and continue to cook for about a minute until the garlic is fragrant.
Drain excess grease, and transfer the mixture to a prepared crockpot.
Stir in tomato paste, diced tomatoes, stewed tomatoes, beef broth, Italian seasoning, salt, and pepper
Cover and cook on low for 8 hours or on high for 4 hours.
Just before serving, add the grated Parmesan and fresh basil. Stir well. Serve over your favorite pasta and enjoy!