Preheat oven to 350°F (175°C) and grease a 9x13 inch baking dish.
Slice the entire block of rolls in half horizontally to create a top and bottom slab.
Place the bottom half of the rolls into the prepared baking dish.
Layer the sliced ham evenly over the bottom rolls, followed by a layer of Swiss cheese slices.
Place the top half of the rolls over the cheese.
In a small bowl, whisk together melted butter, minced garlic, Dijon mustard, Worcestershire sauce, poppy seeds, onion powder, and dried parsley.
Brush the butter mixture evenly over the tops of the rolls.
Cover the dish with aluminum foil and bake for 15 minutes.
Remove the foil and bake for an additional 5 minutes until the cheese is melted and the tops are lightly browned.
Slice into individual sliders and serve warm.