Preheat the oven to 350 degrees
Spray a baking sheet with cooking spray and set aside
Mix the butter, brown sugar, Worcestershire sauce, and onion powder
Cut the rolls in half and put the bottom on the prepared baking sheet
Top with a layer of cheddar cheese, then a layer of ham, and one last layer of cheddar cheese
Add the tops of the rolls and pour the butter mixture over the rolls
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
Remove from the oven, cut, and serve immediately