Preheat oven to 400°F Lightly grease a baking sheet; set aside.
To assemble sandwiches, spread one side of each toast slice with honey mustard. Layer three of the toast slices, mustard sides up, with the turkey, ham, and cheese. Cover with remaining toast slices, mustard side down. Place on the baking sheet.
Bake for 15-20 minutes or until heated through, turning once. Cut in half diagonally.