1. Preheat oven to 425°.
2. Sprinkle beef with salt and pepper. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add beef to pan; cook 2 minutes on each side or until browned.
3. Combine mustard and garlic in a small bowl. Rub mustard mixture evenly over beef. Combine parsley, rosemary, and thyme in a small bowl. Sprinkle beef evenly with parsley mixture. Place beef on a broiler pan coated with cooking spray. Bake at 425° for 26 minutes or until a thermometer registers 135° or until desired degree of doneness. Place tenderloin on a platter; let stand 10 minutes before slicing.