Preheat broiler to high heat and move an oven rack to the highest rack. Turn on fan and open a window as it might get a bit smokey while you are broiling.
Lay out skirt steak on a baking sheet lined with foil and brush with olive oil on both sides. Season both sides well with steak seasoning.
Cook skirt steak on broil on the first side for 4 minutes. Flip and broil on second side for 5 minutes. A flank steak will probably need an additional 5 minutes of broiling. Steaks are done when they hit 130˚F in the thick part of the steak for medium rare steak. Skirt steak is so thin, that you can assume it’s done after the cooking time.
Let steak rest for a few minutes and then slice the steak across the grain into strips.