1. In a large pot or Dutch oven, sauté chopped onions and minced garlic over medium heat until fragrant and translucent.
2. Add the ground Italian sausage and cook until nearly browned. Transfer the sausage to a bowl, leaving any excess fat in the pot.
3. Sprinkle a small amount of flour into the pot, stirring until a light roux forms. Gradually pour in the chicken broth, bringing the mixture to a gentle boil.
4. Break the lasagna noodles into smaller pieces and add them to the boiling broth. Cook the noodles until they reach your desired tenderness, stirring occasionally to prevent sticking.
5. Return the browned sausage to the pot and pour in the half and half or cream. Allow the soup to simmer until it reaches a creamy, luxurious texture.
6. Stir in the kale or spinach and cook until the greens are wilted and tender.
7. Add grated Parmesan cheese into the soup and stir until well incorporated. Adjust the seasoning as needed.
8. Optionally, garnish with crispy prosciutto, sundried tomatoes, or additional Parmesan cheese before serving.
9. Serve hot and enjoy your creamy, hearty White Lasagna Soup!