Cut the chicken filet into strips. Peel onions and garlic and dice finely. Put spaghetti in boiling salted water and cook for about 10 minutes until al dente. Heat oil in a pan.
Fry the chicken meat in it all around. Add onions and garlic and fry briefly. Season with salt, pepper and dried basil. Add chunky tomatoes and simmer for 2-3 minutes.
Refine with cream and cheese. Season sauce with salt and pepper. Drain spaghetti and let it drain. Serve with the sauce on 4 plates. Serve garnished with basil as desired.