In a large pot or Dutch oven, heat olive oil over medium heat.
Add the Italian sausage and cook until browned, breaking it up as it cooks.
Stir in the diced onion and cook until softened, about 5 minutes.
Add garlic and tomato paste, cooking for 1-2 minutes until fragrant.
Pour in the crushed tomatoes, Italian seasoning, and chicken broth. Stir to combine.
Bring to a boil, then add broken lasagna noodles.
Reduce heat and simmer until noodles are tender, about 12-15 minutes.
Stir in heavy cream and season with salt and pepper to taste.
Serve hot with a generous scoop of ricotta, a sprinkle of mozzarella, and fresh basil if desired.