Add pasta, diced tomatoes, onion, garlic, red pepper flakes, olive oil, broth, salt, and pepper to a large pot or Dutch oven.

Boil over high heat; reduce to a vigorous simmer. Cook 10-12 minutes, stirring often, until pasta is al dente and most liquid absorbs.

Stir in cream and Parmesan; rest a minute to thicken.

Taste and adjust seasoning. Top with torn basil and serve straight from the pot.