01 - Boil salt-seasoned water in a large pot and cook pasta until al dente. Reserve 1/2 cup pasta water, then drain.
02 - Heat olive oil in a large skillet over medium heat. Add chopped onion and sauté for 4 to 5 minutes until translucent.
03 - Incorporate minced garlic and cook for 1 minute until fragrant.
04 - Add crushed tomatoes, tomato paste, oregano, basil, and optional red chili flakes. Simmer for 8 to 10 minutes, stirring occasionally.
05 - Reduce heat, stir in heavy cream and grated Parmesan. Simmer 2 minutes. Season with salt and black pepper.
06 - Add cooked pasta to sauce, tossing to coat evenly. Adjust consistency with reserved pasta water if needed.
07 - Plate immediately, garnished with fresh basil and extra Parmesan cheese.