Cook the pasta in salted water until al dente. Set aside approx. 200 ml of the cooking water. Drain the pasta.
Heat the oil in the same pan. Sauté the pepper, onion, garlic and chilli pepper in hot oil for approx. 2 mins. Pour in the cream and reserved cooking water, season with salt, simmer for approx. 5 mins. Stir in the spaghetti.
Sprinkle the cheese and rocket on top of the spaghetti.