Preheat the oven to 350 degrees F and lightly grease a small baking dish that will hold the sliders snugly.
Slice the slider buns in half horizontally and place the bottom halves in the prepared dish.
Layer the sliced ham evenly over the bottom buns, folding pieces as needed so they cover the surface.
In a small bowl, stir together the honey, 2 tablespoons of the butter, Dijon mustard, Worcestershire sauce, and garlic powder until smooth.
Spoon or brush the honey mixture over the ham layer.
Replace the top halves of the buns and press down gently so they sit evenly.
Melt the remaining 2 tablespoons of butter and stir in the poppy seeds. Brush this mixture over the tops of the buns.
Cover the dish with foil and bake for 15 minutes. Remove the foil and bake 5 minutes more until the tops are lightly golden.