Quarter the tomatoes, remove the stem and finely grate the parmesan. Cut the mozzarella into slices. Pluck the basil leaves from the stems. Peel the garlic and dice very finely or use a press.
Mix the cream, crème fraîche or sour cream, garlic and basil. Season more vigorously with salt, pepper, possibly dried basil and sugar to taste.
Put the pasta with tomatoes and mozzarella in a baking dish and mix. Pour the cream mixture over it. Sprinkle with the parmesan. Bake in a preheated oven at approx. 175 ° C, fan oven approx. 150 ° C, for approx. 20 minutes.