Savory Italian Slow-Cooked Lasagna Soup

Ingredients

• 1 tablespoon olive oil
• 1 pound ground Italian sausage
• 1 medium onion, diced
• 3 cloves garlic, minced
• 2 teaspoons dried oregano
• 1/4 teaspoon red pepper flakes
• 2 tablespoons tomato paste
• 1 (28 oz) can crushed tomatoes
• 6 cups chicken broth
• 8 lasagna noodles, broken into pieces
• 1 cup ricotta cheese
• 1/2 cup grated Parmesan cheese
• 1/4 cup chopped fresh basil
• Salt
• pepper
• 2 cups shredded mozzarella cheese