Cook the rigatoni in a large pan of boiling salted water 8-10 mins or until tender. Drain well and set aside.
Heat the oil in a large saucepan and cook the chicken, onion, garlic and basil over a medium heat until the chicken is cooked.
In the meantime, preheat the grill to medium.
Add the tomato passata and spinach and stir well.
Add the pasta to the pan, stirring well to coat in the sauce. Season with salt and pepper.
Spoon into a baking dish, sprinkle with the cheese and bake under the grill (or in preheated oven on 180c) until golden and bubbling. Serve with warm French bread.