Cook the Meat:

In a large pot over medium heat, brown the ground beef or sausage. Drain excess fat, then add the onion and garlic. Sauté for 3-4 minutes, until the onion is translucent.

Make the Soup Base:

Add chicken broth, crushed tomatoes, Italian seasoning, red pepper flakes, salt, and pepper. Bring to a boil, then simmer for 10 minutes.

Cook the Noodles:

Add broken lasagna noodles to the pot. Cook for 8-10 minutes, stirring occasionally, until noodles are tender.

Add Cream and Cheeses:

Stir in heavy cream and Parmesan, followed by mozzarella and spinach, until cheese is melted and spinach is wilted.

Serve:

Taste, adjust seasoning, and garnish with basil or parsley as desired.