In a large bowl, combine halved cherry tomatoes, olive oil, garlic, basil, red pepper flakes, salt, and pepper. Cover and let marinate at room temperature for 4 hours.
Bring a large pot of salted water to a boil. Add pasta and cook according to package directions. Drain well.
Add hot pasta to tomato mixture. Toss with Parmesan and extra basil. Serve immediately with additional Parmesan, if desired.
Notes
The longer the tomato mixture marinates, the better the flavor. Best made with peak-season cherry tomatoes.