Heat grill. Form beef into 12 (4 in) patties 1/4 in thick. Combine spreadable cheese, parsley and salt in medium bowl. Divide mixture into 6 portions; spoon on top of 6 of the patties, spreading to within 3/4 in of edge. Top with remaining patties; pinch edges to seal well.
Brush onion slices with oil. Grill burgers and onions, covered, over medium heat or coals 10-12 minutes or until burgers are thoroughly cooked and onions are tender and beginning to char, turning once.
Toast buns and top burger with onions and condiments of your choice.
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