01 -
Spread Dijon mustard over two slices of bread. Layer two slices of ham, two slices of turkey, and two slices of Swiss cheese on each. Top with the remaining slices of bread to assemble two sandwiches.
02 -
Whisk together the egg, milk, salt, and pepper in a shallow dish until fully blended.
03 -
Melt the butter in a skillet over medium heat. Dip each sandwich in the egg mixture, ensuring both sides and edges are evenly coated. Place in the skillet and cook until evenly golden brown, about 3 to 4 minutes per side.
04 -
Cut each sandwich in half. Dust lightly with powdered sugar and serve warm, accompanied by raspberry or strawberry jam.