1

In a large, shallow dish, whisk together the eggs and milk; set aside.

2

Form two sandwiches with the bread and chocolate (break the chocolate as necessary to cover the bread without extending over the edges); dip both sides of the sandwiches in the egg mixture to coat.

3

Heat the butter in a large skillet over heat; transfer the sandwiches to the skillet. Cook, pressing occasionally with a spatula, until golden, 1 to 2 minutes per side. Transfer to a paper-towel-lined plate. Cut each sandwich in half, and dust with confectioners' sugar before serving.