Preheat your oven to 350°F or set up your air fryer according to its instructions.
Place a layer of aluminum foil on the bottom of a baking dish for easy cleanup.
Slice a package of Hawaiian sweet rolls in half horizontally to separate the tops from the bottoms.
Place the bottom halves of the rolls in the prepared baking dish.
Lay sliced ham onto the roll bottoms and add a layer of cheese on top.
Spread a thin layer of mayo on the inside of the roll tops, then place them onto the sandwich layers in the baking dish.
In a small bowl, mix melted butter, onion powder, Worcestershire sauce, Dijon mustard, poppy seeds, and a pinch of kosher salt.
Drizzle the butter mixture over the top of the sliders, ensuring even coverage.
Cover the baking dish with aluminum foil and let the sliders rest for 10 minutes.
Bake for 20 minutes, until the cheese is melted and the tops are lightly browned.
Let the sliders cool for a few minutes before enjoying as an appetizer or meal!