Brown ground beef in a skillet over medium heat until fully cooked and drain excess fat.
Transfer cooked beef to a slow cooker.
Add diced onion and bell pepper to the slow cooker.
Pour in crushed tomatoes and petite diced tomatoes.
Mix in minced garlic and Italian seasoning.
Add beef broth and stir to combine.
Cover and cook on low for six to eight hours or high for three to four hours.
Break lasagna noodles into smaller pieces and add to the slow cooker.
Cover and cook on high for an additional thirty minutes until noodles are tender.
Serve the soup in bowls and top with ricotta cheese, shredded mozzarella, and parmesan cheese.
