Preheat the oven to 400F.
Rinse the tomatoes and sliced into halves. Toss gently with the olive oil. Season with salt and pepper. Arrange the tomatoes on a baking dish, and top with Parmesan cheese. Roast the tomatoes for about 15-20 minutes or until the Parmesan cheese melted and the top is slightly browned.
Remove from the oven and serve immediately.