Spread the tomatoes on a baking sheet and dress with evoo, salt, pepper, thyme, and garlic. Roast at 400 for 25-35 minutes. Discard the thyme sprigs and transfer the tomatoes, garlic and all the juices to a large pan over medium heat. Give the tomatoes and garlic a light smash. Add 2 tbsp of butter. Toss in the cooked spaghetti and reserved pasta water. Mix well, toss in the basil and parmesan cheese. Transfer to a dish and top with burrata cheese and more fresh basil.