Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Sprinkle both sides of steaks evenly with 1/4 teaspoon salt and 1/4 teaspoon pepper. Add steaks to pan; cook 3 minutes on each side or until desired degree of doneness. Remove from pan. Add shallots to pan; sauté 1 minute. Stir in vinegar and soy sauce, scraping pan to loosen browned bits; cook 1 minute or until liquid evaporates, stirring constantly. Add remaining 1/4 teaspoon salt, remaining 1/4 teaspoon pepper, wine, and broth; bring to a boil. Cook until reduced to 1/2 cup (about 11 minutes). Remove from heat; stir in butter. Serve with steaks.