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Preheat oven to 350F.
Cut each roll in half, lengthwise and place bottom halves on the bottom of a baking pan or casserole dish. *You might consider lining the bottom of your baking dish or pan with aluminum foil for easy clean up of the bottom of the pan.
Layer bottom half of the rolls with a slice of ham and on top of the ham place a slice of Swiss cheese. Place the top half of the rolls back on.
In a bowl, mix together the butter, dijon mustard, Worcestershire sauce, poppy seeds and onion powder. Brush lightly over the tops of the rolls. I personally just like a light coating but I do know some people really love a lot of sauce on top, so do so based on your personal preference.
Let sit for 10-20 minutes.
Bake uncovered on the center rack for 10-15 minutes or until cheese is melted and bun tops are a light golden color.