1 Heat 1 teaspoon of the oil in a large skillet over medium-high heat until hot. Sprinkle steak with salt and pepper; cook 7 to 9 minutes for medium-rare or until of desired doneness, turning once. Place on platter; cover loosely with foil.
2 Heat butter and remaining 1 teaspoon oil in same skillet over medium high heat until butter is melted and oil is hot. Add garlic; cook 30 seconds. or until fragrant. Add mushrooms; cook 2 to 4 minutes or until softened stirring to scrape up any browned bit from bottom of skillet. Remove from heat; stir in tarragon, chives and Worcestershire sauce. Spoon mushrooms over steak.