Step 1

Preheat the oven to 350 degrees. Spray a 9 by 13 inch baking dish with cooking spray and set aside.

Step 2

Mix together the butter, brown sugar, mustard, Worcestershire sauce, poppy seeds, onion.

Step 3

Cut the rolls in half and put the bottom in the prepared baking dish. Top with half the ham. Add the cheese, and top with the remaining ham.

Step 4

Add the tops of the rolls and pour over the butter mixture. Cover with foil and bake for 15 minutes. Remove from the oven and remove the foil. Return to the oven and bake for an additional 10 minutes.

Step 5

Remove from the oven, cut and serve immediately.