Cook the tortellini for 13-15 minutes in boiling salted water. Fry the bacon in a pan without fat until crispy. Take out and let drain on kitchen paper. Mix vinegar with salt, pepper and sugar.
Gradually fold in the oil. Drain the tortellini and pour the prepared marinade over them while still hot. Clean and wash the tomatoes, spring onions and mushrooms. Halve the tomatoes, cut the spring onions into rings and the mushrooms.
Mix with the tortellini. Pluck the basil leaves, chop if necessary. Drain mozzarella and cut into small pieces. Break the bacon into pieces. Mix basil, mozzarella and bacon into the salad.
Season salad again. Mix cream cheese and milk and drizzle over the salad. Serve garnished with basil.