Wash the zucchini and cut into fine letters. Fry lightly in olive oil with the garlic, season. Cook the penne in plenty of salted water until al dente, drain, rinse with a little cold water and mix with the zucchini.
For the sauce, sauté the onions and garlic in the olive oil, pour in the cream, bring to the boil and simmer on a low fire for about 5 minutes. Fold in the parmesan, season. Mix the courgette penne with the sauce, serve and sprinkle with parmesan