To prepare rub, heat a small skillet over medium heat. Add peppercorns; cook 1 minute or until fragrant. Transfer toasted peppercorns to a spice grinder; grind until fine. Combine ground peppercorns, salt, mustard, garlic powder, and thyme in a small bowl. Rub peppercorn mixture evenly over steak. Let stand for 10 minutes.
Heat a nonstick grill pan over medium-high heat. Coat the flank steak with cooking spray; grill 7 minutes on each side or until desired degree of doneness. Let stand 5 minutes before slicing. Garnish with chopped parsley, if desired.
I made this with a Filet Mignon cut of meat on a cast iron pan. It was quick, easy and excellent! The rub is out of this world good. I toasted the peppercorns as they suggested and it added so much flavor to the meat...something so simple. I will definitely make this again. A true special occasion recipe!
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