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In a large cast-iron skillet, cook thinly sliced medium yellow onions in butter over medium-low heat 20 minutes, stirring frequently, until browned. Season with 1/4 teaspoon salt; remove to a bowl. Combine ground chicken with grated yellow onion, Worcestershire sauce, garlic powder, ground mustard, the remaining 1/2 teaspoon salt and black pepper. Form into four 1-inch-thick patties.
Add vegetable oil to the same skillet. Cook patties 4 to 5 minutes per side, until internal temperature reaches 165°F. Remove to a plate. Butter the one side of each bread slice. On each of 4 bread slices, place a burger patty, 1/4 of the onions and 1 slice Swiss cheese and top with another bread slice. Add all 4 patty melts to the pan, cover with foil and press down with another heavy pan. Cook 3 minutes per side, until bread is toasted and cheese is melted.