01 - Preheat the oven to 400°F.
02 - In a large baking dish, combine cherry tomatoes, garlic, red onion, olive oil, oregano, red pepper flakes, salt, and pepper. Toss to coat evenly.
03 - Create a well in the center of the vegetables and place the feta cheese block. Drizzle additional olive oil over the feta.
04 - Roast for 30–35 minutes until tomatoes burst and release their juices, and the feta becomes golden and soft.
05 - While the feta roasts, cook pasta in a large pot of salted boiling water according to package directions until al dente. Reserve ½ cup pasta water before draining.
06 - Remove the baking dish from the oven. Using a fork or spoon, mash the feta and tomatoes together until combined into a smooth, creamy sauce.
07 - Add the drained pasta and most of the basil to the baking dish. Toss thoroughly, adding reserved pasta water as needed to reach desired sauce consistency.
08 - Serve immediately, garnished with additional fresh basil leaves and freshly ground black pepper.