Peel the onion and cut into small cubes. Then the cherry tomatoes are halved. Drain the mozzarella and dice it too. The noodles are cooked firm to the bite in boiling salted water.
Heat a pan with oil and sauté the onions. Then add the tomatoes and let simmer for 3 - 4 minutes. Stir in the whipped cream, add 3 - 4 basil leaves and season with salt, pepper, sugar and chilli.
Drain the pasta and distribute it in a baking dish. Mix the sauce with the pasta and fold in the halved cherry tomatoes and mozzarella cubes. Before the casserole dish is put in the oven for about 15 minutes at 200 ° C, it is sprinkled with the rest of the mozzarella.