Get pan on medium heat, with enough vegetable oil to lightly coat the bottom of the pan.
Pound or slice chicken thin.
In separate dishes, place flour, bread crumbs (seasoned with salt & pepper), and a beaten egg.
Coat both sides of chicken with flour (dredge).
Place dredged chicken into egg wash, let excess egg run off chicken, then place into panko crumbs, coating both sides of the chicken.
Place into frying pan, cooking for about 3 minutes on each side, or until golden brown.
While chicken is cooking, butter the outside of each slice of bread.
Spread chicken soup concentrate on bottom slice, and mayonnaise on top slice.
Place two slices of ham on bottom slice.
Once chicken is done cooking, place on top of ham, then place swiss cheese, and top slice of bread.
Place in pan, turn heat to medium and cover, cooking until golden brown on each side.