1 lb (450 g) ground beef (80 / 20) 8 slices American cheese (2 per burger) 1 large onion, sliced into rings 1 tbsp (15 ml) oil or butter (for onions) 1 tsp salt 1 / 2 tsp pepper 4 buns Mustard, to taste Pickles, to taste
1. Heat oil or butter in a skillet and griddle onion rings over medium heat until soft and caramelized, about 12–15 minutes; remove and keep warm. 2. Divide beef into 8 portions and form into thin patties; season both sides. 3. Place two folded slices of American cheese on 4 patties, top with remaining patties and crimp edges tightly to seal the double-cheese center. 4. Chill patties 15 minutes to help seal. 5. Cook on a hot griddle or skillet 3–4 minutes per side until deeply browned and internal temperature is 160°F (71°C). 6. Rest burgers briefly, toast buns, top with griddled onions and mustard or pickles as desired, then serve. Note: For all stuffed burgers, ensure the internal temperature reaches 160°F (71°C) to safely cook ground beef; be cautious when biting into the center — molten cheese can be very hot.
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