Cook the pasta in salted water and a drizzle of olive oil until it is to your liking.
Tip: don't cook all the way through, the pasta will still cook in the sauce when it goes in the oven.
Cook and shred the chicken, reserving the cooking water
In a pan, sauté the onion, tomato and pepper, add the shredded chicken, the ready-made sauce, cream and a little of the chicken cooking water, season to taste.