Sprinkle salt and pepper over steaks. Heat oil in a 9-inch cast-iron skillet over medium-high heat until hot. Add steaks; cook 5 minutes on each side or until desired degree of doneness. Remove steaks from skillet; keep warm. Add shallots to skillet; sauté 30 seconds. Add cognac; cook 10 seconds. Add broth and mustard; stir well. Reduce heat; cook 2 minutes, stirring constantly. Serve steaks with sauce.
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