Making Ham and Cheese Sliders on Hawaiian Rolls is straightforward. Follow these steps to create these mouthwatering treats:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare the Baking Dish: Lightly grease a 9×13-inch baking dish or line it with parchment paper for easy cleanup.
3. Slice the Rolls: Carefully cut the Hawaiian rolls in half horizontally, keeping them connected.
4. Layer the Ham: Place the bottom half of the rolls in the prepared baking dish. Layer the sliced ham evenly on the rolls.
5. Add the Cheese: Place the Swiss cheese slices over the ham, ensuring even coverage.
6. Replace the Tops: Place the tops of the rolls back on, creating a complete sandwich.
7. Prepare the Butter Mixture: In a small bowl, mix the melted butter, Dijon mustard, poppy seeds, garlic powder, and onion powder until fully combined.
8. Brush the Mixture: Use a brush to generously coat the tops of the rolls with the butter mixture.
9. Bake: Cover the dish with aluminum foil and bake for 15 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the tops are golden brown and the cheese has melted.
10. Cool and Serve: Once baked, let the sliders cool slightly before slicing them apart.

You now have a delicious batch of Ham and Cheese Sliders on Hawaiian Rolls ready to be enjoyed!