Step 1

Sprinkle steak evenly on both sides with steak seasoning.  Coat a grill pan with cooking spray and heat over medium-high heat until hot.  Place steak on grill pan and cook 10 to 15 minutes for medium doneness, turning halfway through cooking.  Let steak stand 5 minutes, then carve diagonally across the grain into thin slices.

Step 2

Meanwhile, arrange mixed greens, tomato chunks, and rings of onions on a serving platter.  Top with steak slices and crumbled blue cheese.  Drizzle with dressing and serve.