Heat the olive oil in a large lidded skillet over medium heat. Add the garlic and red pepper flakes and cook for 30 seconds, then add the broccolini and salt and toss.

Cook, tossing occasionally, for 2 minutes. Add Parmesan cheese. Add the water, cover, reduce the heat, and cook for 3 to 5 minutes, tossing occasionally, or until tender and bright green.