Gather bread, ham, turkey, Swiss cheese, eggs, milk, salt, pepper, and butter
Spread mustard or mayonnaise on bread if desired
Layer ham, turkey, and Swiss cheese between two slices of bread
Press the sandwich together and trim crusts if desired
Beat eggs with milk, salt, and pepper in a shallow bowl
Dip the sandwich into the egg mixture, coating both sides
Melt butter in a skillet over medium heat
Cook the sandwich until golden brown on both sides and the cheese is melted
Remove from the skillet and let it rest briefly
Dust with powdered sugar if desired
Serve with jam or preserves if desired