Cook the spaghetti in boiling salted water for about eight minutes. In the meantime, clean, wash and slice the tomatoes. Drain the mozzarella and cut into slices.
Peel the garlic and press it through a garlic press. Peel and finely grate the onion. Drain the spaghetti and let it drain well. Mix eggs and cream, add salt, pepper, garlic, onion, P
Put the spaghetti in a mixing bowl, pour 3/4 of the egg-cream on the spaghetti, mix well and turn into nests with fork and tablespoon. Place on a baking tray lined with baking paper. Let the rest of the egg-cream run into the nests.
Place one slice of tomato and one slice of mozzarella on each nest. Place the remaining tomato slices on the baking tray. Spread the fat in flakes on the mozzarella. Sprinkle with herbs of Provence and bake in the preheated oven (electric: 200°C/ gas: level 3) for 15 to 20 minutes.
Pluck the basil leaves from the stalk. Serve nests on the tray and garnished with the basil leaves.