Slice rolls and place bottom halves in a 13x9-inch pan.
In a small bowl, combine mayonnaise and whole-grain mustard. Spread thinly over rolls in pan.
Cut cheese slices into quarters. Place one quarter on each roll. Top with a slice of ham and remaining cheese quarters. Add tops of rolls.
In a small bowl, whisk together butter, Worcestershire sauce and Dijon mustard. Using a pastry brush, brush mixture over top of rolls. Sprinkle with dried onion flakes and poppy seeds.
Cover with aluminum foil. Bake for 20 minutes. Remove foil and bake for another 5 to 6 minutes or until rolls are brown and crispy.
Slice rolls and place bottom halves in a 13x9-inch pan.
In a small bowl, combine mayonnaise and whole-grain mustard. Spread thinly over rolls in pan.
Cut cheese slices into quarters. Place one quarter on each roll. Top with a slice of ham and remaining cheese quarters. Add tops of rolls.
In a small bowl, whisk together butter, Worcestershire sauce and Dijon mustard. Using a pastry brush, brush mixture over top of rolls. Sprinkle with dried onion flakes and poppy seeds.
Cover with aluminum foil. Bake for 20 minutes. Remove foil and bake for another 5 to 6 minutes or until rolls are brown and crispy.