Preheat oven to 350 degrees.
Coat a 9x13 baking dish with cooking spray.
Line the bottom of the pan with the bottom halves of the sweet rolls.
Top the ham, then the provolone cheese slices.
Spread the cream cheese onto the bottoms of the sweet roll tops and place them in a layer on top of the cheese.
In a medium bowl, combine the butter, mustard, Worcestershire sauce, onions and parmesan cheese. Mix well and pour evenly over tops of the sandwiches.
Sprinkle the poppy seeds over the top.
Cover with aluminium foil and bake in the pre heated oven for 25 minutes, or until warmed through. Cut all the seams with a knife and serve warm.
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