Preparing Stuffed Burgers
Shape 1-1/2 lbs. of ground chuck into eight 3-oz. portions on waxed paper. Press each portion into a 4-in. patty using a fork.
Top four of the patties with an onion slice and shredded cheese. Cover with remaining patties, using waxed paper to help position the patty on top.
Seal edges with a fork. Grill to desired doneness.
Image of final burger.