1. Prepare Burger Spread, set aside.
2. Prepare grill for direct cooking.
3. Combine beef, parsley,onion powder, Worcestershire sauce, garlic powder, salt and pepper in a medium bowl; mix lightly but thoroughly. Shape into 4 1/2 inch-thick burgers.
4. Place burgers on grid. Grill,covered, over medium heat 8 to 10 minutes (or, uncovered, 13 to 15 minutes) to medium (160 degrees F) or to desired doneness, turning halfway through grilling time.
5. Remove burgers from grill. Place burgers between buns; top each burger with Burger Spread .