1. Heat 1 teaspoon oil in a large skillet over medium-high heat. Sprinkle steak with 1/8 teaspoon salt and 1/8 teaspoon black pepper. Add steak to pan; cook 4 minutes on each side or until desired degree of doneness. Remove steak from pan. Add remaining 2 teaspoons oil to pan. Add onion and next 5 ingredients (through poblano); sauté 5 minutes or until vegetables soften. Cut steak across the grain into thin slices. Add steak, remaining 1/8 teaspoon salt, and 1/8 teaspoon black pepper to pan; cook 1 minute. Place about 1/3 cup steak mixture in each tortilla. Top each taco with 1 tablespoon cheese and 1 tablespoon salsa.