Combine first 7 ingredients, whisking to dissolve flour.
Coat a medium nonstick skillet with cooking spray; add butter. Place over medium-high heat until hot. Add steaks, and cook 4 minutes on each side or to desired degree of doneness. Transfer steaks to a plate; keep warm.
Whisk broth mixture; add to pan. Bring to a boil; cook 1 minute or until reduced to 1/4 cup, scraping pan to loosen browned bits. Serve sauce over steaks.