Heat a large cast-iron skillet over high heat.
Combine first 7 ingredients in a bowl.
Coat pan with cooking spray. Add steaks to pan; cook 5 minutes on each side or until desired degree of doneness. Remove steaks from pan. Add mushrooms to pan, and cook 3 minutes or until lightly browned. Remove mushrooms from pan. Remove pan from heat; add Marsala, scraping the pan to loosen browned bits. Reduce heat to medium. Return pan to heat. Add broth mixture to pan; bring to a boil. Cook 1 minute, stirring frequently. Stir in mushrooms.