This crockpot lasagna soup gives you all the cheesy, layered comfort of classic lasagna without the hassle. Just toss in the ingredients, let the slow cooker work its magic, and enjoy a cozy, creamy bowl that tastes like Nonna’s kitchen—no oven required.
Heat olive oil in a skillet over medium-high. Brown sausage until cooked through, 5–7 minutes. Season with salt and pepper. Transfer to crockpot.
In the same skillet, sauté onion and red bell pepper for 3–4 minutes. Add garlic and tomato paste; cook 1 minute until fragrant. Transfer to crockpot.
Add crushed tomatoes, diced tomatoes, broth, Italian seasoning, basil, red pepper flakes, bay leaf, salt, and pepper to the crockpot. Stir well.
Cover and cook on Low for 6–7 hours or High for 3–4 hours. Adjust seasoning midway if possible.
About 30 minutes before serving, stir in broken lasagna noodles. Cook on High until al dente, stirring occasionally to prevent sticking.
Optional: Stir in heavy cream and/or spinach in the last 5 minutes. Spinach wilts quickly.
In a small bowl, mix ricotta, half the mozzarella, half the Parmesan, plus salt and pepper. This will be the cheesy topping.
Ladle soup into bowls. Dollop with cheese mixture, sprinkle remaining mozzarella and Parmesan, and garnish with fresh parsley or basil.
Notes
For best results, cook noodles just before serving to prevent sogginess in leftovers. Store soup without noodles in the fridge for 3–4 days or freeze for up to 3 months.