Preheat oven to 400°F. Bake bacon on a slotted pan to crisp, 12-14 minutes.
Meanwhile, whisk together eggs, milk, salt, pepper and mustard. Melt butter in a small pan over low heat.
Preheat a nonstick griddle pan over medium heat. Build sandwiches of cranberry sauce, turkey, bacon, Swiss cheese and pickles. Coat in the egg batter. Liberally brush griddle with the melted butter and cook sandwiches until golden and warmed through -- use a loose tin foil tent to help melt cheese. Brush pan with more butter as needed.