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HEAT grill to medium-high heat.
MIX mayo, onions and 2 Tbsp. barbecue sauce. Mix meat and remaining barbecue sauce just until blended; shape into 6 (1/2-inch-thick) patties.
GRILL 4 to 5 min. on each side or until done (160ºF).
SPREAD buns with mayo mixture; fill with burgers and chips.