Preheat oven to 350°F (175°C).
Place bottom halves of slider rolls in a baking dish.
Layer sliced roast beef evenly over the rolls.
Top beef with provolone cheese slices.
Cover with top halves of the slider rolls.
In a bowl, mix melted butter, garlic powder, onion powder, and Worcestershire sauce.
Brush butter mixture over the tops of the rolls.
Sprinkle with chopped parsley.
Cover loosely with foil and bake for 10 minutes.
Remove foil and bake for another 10 minutes until cheese is melted and tops are golden.
Heat beef broth in a saucepan and serve as au jus for dipping.