Preheat oven to 400°F. Place Boursin cheese in a casserole dish, surround with cherry tomatoes, red onion, and garlic. Drizzle with olive oil and season with oregano, salt, and pepper.
Bake for 25-30 minutes until tomatoes burst and onion softens. Meanwhile, cook pasta according to package instructions, reserving ½ cup of pasta water.
Mix cheese and roasted vegetables, then add basil. Toss in cooked pasta, gradually adding reserved pasta water to reach desired sauce consistency. Serve with optional basil and parmesan.
Notes
For a creamier sauce, add more pasta water as needed.