Preheat oil in a medium skillet over medium-high heat.
In a bowl combine ground chicken or turkey, garlic, Worcestershire sauce and salt and pepper, to taste. Be careful not to over mix.
Form 8 even thin patties, about ½-inch thick and set aside. On the center of four patties, lay down a slice of ham. Add a spoonful of Swiss cheese, then top with another slice of ham. Top each with another patty and seal the edges. Sear burgers over medium-high heat, flipping once until internal temperature reaches 165ºF, approximately 6 minutes each side.
Stir together dijon mustard and mayo.
Serve on Brioche buns with dijon mayo and any toppings you like.