04Top 6 patties with the cheese mixture, spreading it to within 1/2-inch of the edge (if the mixture is difficult to spread, try heating in the microwave for about 15 seconds).
05Press the mushrooms into the cheese.
06Cover each patty with one of the remaining 6 patties, sealing the edges well.
07Broil or grill the patties (4-inches from the heat), turning only once if possible, until preferred doneness and cheese is melted, about 10 to 15 minutes.
08Low-carb serving: top with a bit of grated Swiss cheese and enjoy!
09High-carb serving: eat with a bun and other condiments.
10To make it extra-special, top each with a couple strips of crispy bacon.