Preheat the oven to 350°F (175°C).
Grease a 9x13-inch baking dish or line it with parchment.
Slice the slider rolls horizontally, keeping the sheet intact.
Place the bottom half of the rolls in the prepared dish in an even layer.
Layer the deli ham evenly over the bottom rolls, slightly overlapping slices.
Arrange Swiss cheese slices over the ham to cover evenly.
Replace the top half of the rolls over the cheese to form the sliders.
In a bowl, whisk together melted butter, mustard, Worcestershire sauce, poppy seeds, onion powder, garlic powder, salt and pepper.
Brush the butter‑mustard glaze generously over the tops of the rolls.
Cover the dish with foil and bake 12 minutes to warm through and melt the cheese.
Remove the foil and bake an additional 3–6 minutes until the tops are golden.
Let rest 2 minutes, slice between sliders, garnish with chives if desired, and serve warm.