1 pound rigatoni pasta
3 tablespoons olive oil
4 large garlic cloves, minced
1 cup red spring onions, thinly sliced
1 cup shiitake mushrooms, stems removed and thinly sliced
3 medium zucchini, halved and thinly sliced
½ teaspoon red pepper flakes, or to taste
¼ cup half and half
Salt and freshly ground black pepper, to taste
Grated parmesan or pecorino cheese, for topping