Preheat the oven to 350°F/180°C, and grease a 9x9 or 7x11 inch baking pan/sheet (if you don’t have either, then use 9x13).
In a small bowl, combine melted butter, Dijon mustard, honey, poppy seeds, minced onion, garlic, and Worcestershire sauce.
Slice the rolls in half using serrated knife to separate the tops from the bottoms.
Over the bottom of the rolls, layer half of the ham, all of the cheese, then the remaining ham slices. Cover with the top of the rolls.
Brush the butter mixture over the tops (or pour it over the rolls), cover with foil and bake for 15 minutes. Remove the foil, and bake uncovered for 10 more minutes or until done/golden brown. Watch the sliders so they don’t burn.
Not a ham fan? Make these with thinly sliced turkey or deli-style chicken instead.
Switch up the cheese. Swiss is a classic flavor, but you can try mozzarella, provolone, American, or cheddar cheese instead.
Unsalted Butter: I like to avoid adding salt to the butter mixture because I like more of the sweet and savory flavors to come through. If you want, you can use salted butter or add a pinch of salt to the butter mixture, but it’s not necessary. The ham adds the right amount of saltiness to this recipe.
Use a Serrated Knife: Hawaiian rolls are very soft, so a regular straight knife will crush them. A serrated knife does the best job of slicing through them easily.
Another trick for easily slicing Hawaiian rolls: Place them in the freezer for about 15 minutes. They will firm up a bit and slice super easily.