¼cupchopped fresh basil leavesplus additional for serving
Instructions
In a large skillet, heat the oil over medium high. Add the beef, onion, bell pepper, garlic, Italian seasoning, black pepper, and red pepper flakes. Cook, breaking apart the meat, until it is browned outside and the onion is beginning to soften, about 5 minutes. The beef doesn't need to be completely cooked through at this point.
Transfer to a 6-quart or larger slow cooker. Add marinara, chicken broth, and Parmesan rind.
Cover and cook on LOW for 7 to 8 hours or HIGH for 4 to 5 hours.
Stir in the lasagna noodles. Recover and cook on LOW until the noodles are tender but not mushy, about 25 to 35 minutes depending upon your slow cooker and the size of your noodle pieces.
Meanwhile, in a small bowl stir together the topping: ricotta, mozzarella, Parmesan, salt, and 1/4 cup basil.
Uncover the soup and stir in the spinach until it wilts.
To serve, ladle the soup into bowls. Top with a great big dollop of the ricotta mixture and fresh basil.
Notes
TO STORE: Leftover crockpot lasagna soup may be kept in the refrigerator for up to 5 days. The ricotta topping can be refrigerated for 3-4 days.
TO FREEZE: Freeze for up to 3 months. Let thaw overnight in the refrigerator, before warming. I have not tried freezing the ricotta topping but it should freeze and thaw just fine.
TO REHEAT: Warm leftover lasagna soup on the stovetop or in the microwave until heated through. Let the ricotta mixture come to room temperature before topping the reheated soup.