An easy recipe for Slow Cooker Lasagna Soup. This hearty, delicious recipe is perfect for chilly weather or anytime you want lasagna without layering noodles and firing up your oven. Customize with your favorite noodles and all the cheese!
In a large skillet over medium-high heat, combine sausage, onions, and carrots. Cook until the sausage has browned and the vegetables has softened, about 5 to 7 minutes. Drain if desired. Stir in garlic until fragrant, about 30 seconds.
Meanwhile, add diced tomatoes and their juice, tomato sauce, mushrooms, Italian seasoning, basil, fennel, 1 teaspoon salt, and ½ teaspoon pepper to the slow cooker. Stir in water and sausage mixture.
Cover and heat on HIGH for 4 hours or LOW for 8 hours. During the last 10 minutes of cooking time, stir in the pasta, cover, and continue to cook until softened. Serve with mozzarella cheese on the side.