Preheat oven to 350 degrees.
Place a slice of ham, a small slice of swiss cheese and a thin pickle slice inside each roll.
Put the top on rolls and place in a 13x9 baking dish with the rolls touching.
In a bowl whisk together Dijon mustard, melted butter, onion powder, Worcestershire sauce and poppy seeds.
Brush mixture over rolls.
Cover pan with foil and bake for 12-15 minutes or until cheese is melted.
Uncover and place back in the oven for an additional 3 minutes or until tops are lightly brown and crispy.