Making Ham and Cheese Sliders on Hawaiian Rolls is straightforward if you follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Dish: Lightly grease a 9×13-inch baking dish.
3. Cut Rolls: Without separating the rolls, slice the entire batch of Hawaiian rolls in half horizontally.
4. Layer Ham: Place the bottom half of the rolls in the prepared dish. Layer ham slices evenly over the bottom half.
5. Add Cheese: Place Swiss cheese slices on top of the ham, covering it completely.
6. Top with Rolls: Place the top half of the rolls back on top of the cheese.
7. Prepare Sauce: In a small bowl, whisk together melted butter, Dijon mustard, poppy seeds, minced onion, salt, and pepper.
8. Brush Sauce: Pour the butter mixture evenly over the top of the slider rolls, using a brush for an even coating.
9. Bake: Cover the dish with aluminum foil and bake in the preheated oven for 15 minutes.
10. Uncover and Brown: Remove the foil, and bake for an additional 5-10 minutes until the tops are golden and crispy.
11. Serve: Take out of the oven and let cool slightly before cutting into individual sliders.

These steps will guide you to create irresistible Ham and Cheese Sliders on Hawaiian Rolls, perfect for any occasion!