1. In a medium bowl, combine butter, garlic, onion powder, and parsley; mix well. Place down center of a 12-inch-square piece of wax paper and roll into a 1-inch-thick log. Wrap tightly and refrigerate about 1 hour, or until firm. 2. Sprinkle each side of steak evenly with salt and pepper. Coat a grill pan or large skillet with cooking spray and heat over medium-high heat. 3. Cook steaks 6 to 8 minutes per side for medium doneness, or to desired doneness. Melt a slice of herbed butter over each steak and serve immediately.