Build two sandwiches with ham, turkey and Swiss between the bread.

Whisk the eggs, milk and salt in a shallow dish.

Melt butter in a cast-iron skillet over medium-low heat and dip each sandwich quickly on both sides in the egg mixture.

Griddle for 4 to 5 minutes per side until golden, the cheese melts and the egg coating is fully set.

Dust lightly with confectioners' sugar and serve with jam alongside.