Melt butter and mix in mustard, Worcestershire sauce, and dried onion.
Place the pack of dinner rolls on a rimmed baking sheet. Using the edges of the baking sheet as a guide, cut the dinner rolls in half, horizontally.
Place the bottom half of the rolls in a 9x13 baking dish.
Cover the bottom half with the ham and cheese. Overlapping the food.
Cover with the top half of the rolls.
Drizzle butter mixture over the top of the rolls, making sure onion has distributed evenly.
Bake uncovered at 350ºF for 15-20 minutes.
Once finished heating up, separate to serve.