Brown the sausage: Place a large pot or deep skillet over medium heat. Add sausage (and olive oil if needed). Break it up with a spatula and cook until browned and crumbly, about 5–7 minutes.
Soften aromatics: Add onion and a pinch of salt.
Cook 3–4 minutes until softened. Stir in garlic and cook 30 seconds until fragrant.
Add the “dump-and-go” elements: Pour in crushed tomatoes, 2 1/2 cups chicken broth, Italian seasoning, and red pepper flakes. Stir in the dry pasta.
Make sure pasta is mostly submerged; add extra broth if needed.
Simmer: Bring to a gentle boil, then reduce to medium-low. Cover and cook 10–12 minutes, stirring once or twice to prevent sticking, until pasta is al dente.
Make it creamy: Uncover. Stir in heavy cream and Parmesan.
Simmer 2–3 more minutes, stirring, until sauce thickens and coats the pasta. If it seems tight, add a splash of broth; if it’s thin, simmer another minute.
Season and finish: Taste and add salt and pepper as needed. Remove from heat.
Sprinkle with chopped basil or parsley and extra Parmesan.
Serve: Spoon into bowls while hot. A green salad and garlic bread make it a complete meal.