Place two slices of bread on work surface and spread with Dijon mustard. Place a slice of cheese on each slice of bread. Layer ham on one slice of bread and turkey on the other. Top turkey with bacon. Place sides of sandwich together.
Beat one egg and milk together in pie plate. Dip each side of sandwich in egg mixture.
Heat medium saute pan over medium heat. Melt butter in pan and place sandwich in pan. Cook until golden brown. Flip and cook until golden on the second side.
Place sandwich on work surface and slice in half. Sprinkle sandwich with powdered sugar. Place on serving plate and serve with jam.