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1 (4 oz.)
grated parmesan cheese
Cut mushrooms into very tiny pieces. (I use a food processor)
Mix beef, egg, mushrooms, onion powder, parsley, and Parmesan well.
Form into 4 equal patties. Grill or fry until done.
Top each with a slice of Swiss cheese and serve on a bun. You can Add mayonnaise, mustard and other garnishes if desired.