Combine ground beef, 2 Tbsp. Hellmann's® Real Mayonnaise, egg, garlic and black pepper in large bowl; shape into 4 patties.
Heat oil in large skillet over medium-high heat and cook patties* until desired doneness, about 8 minutes. Top with cheese and cook until cheese is melted. Evenly spread remaining 4 Tbsp. Mayonnaise, then top with burgers, lettuce, tomato and, if desired, sliced red onion.