1. Place a large pot or Dutch oven over medium heat and add the olive oil.2. Add the diced onion and sauté for 3-4 minutes, until softened. Add the minced garlic and red pepper flakes and cook for 1 more minute until fragrant.3. Add the uncooked pasta, small broccoli florets, vegetable broth, salt, and pepper to the pot.4. Stir well to combine. Increase the heat and bring the mixture to a boil.5. Once boiling, reduce the heat to a simmer, cover the pot, and cook for 10-12 minutes, or until the pasta is al dente and most of the liquid has been absorbed. Stir occasionally to prevent the pasta from sticking.6. Remove the lid and turn off the heat.7. Stir in the heavy cream and grated Parmesan cheese until the cheese is melted and the sauce is smooth and creamy.8. Serve immediately, garnished with more Parmesan if desired.