Preheat grill OR oven broiler to MEDIUM heat. In a small bowl, combine first 5 ingredients (parsley through crushed red pepper flakes).
Sprinkle steaks with salt and pepper to taste. Lightly coat grill grate/broiler pan rack with olive oil then grill/broil steaks to desired level of doneness.
Transfer to a platter or casserole dish and pour parsley sauce over the top, being sure to coat at least one side of each steak.
Cover with aluminum foil wrap to hold in the heat and allow steaks to rest for about 5 minutes then thinly slice across the grain (diagonally). Serve any remaining sauce on top and enjoy!!