Crumble ground beef into bowl. Add onion, ketchup, garlic, salt, and black pepper. Mix gently. Form mixture into 12 round patties, about 1/4 inch thick.
Fold cheese slices into quarters and placee on half of the patties. Top with bacon and remaining patties.
Seal well, forming 6 stuffed burgers.
Grill covered 11-14 minutes for medium doneness or until meat is no longer pink, turning once.
Meanwhile, place bun halves, cut side down on grill for 30-60 seconds until buns are lightly toasted.
Place burgers on buns.
Optional toppings: lettuce, onion, tomato, pickles
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