Preheat oven to 350°F (175°C).
Slice the Hawaiian rolls in half horizontally, keeping them connected.
12 sweet Hawaiian rolls
Place the bottom half of the rolls into a baking dish.
Layer the turkey evenly over the rolls, then add the cheese slices.
1 lb sliced turkey
Place the top half of the rolls back on.
In a small bowl, mix the melted butter, Dijon mustard, garlic powder, and onion powder.
¼ cup butter
Brush the butter mixture evenly over the tops of the rolls.
Cover loosely with foil and bake for 15 minutes.
Remove foil and bake for an additional 5 minutes, or until the tops are golden and the cheese is melted.
Remove from oven, slice into individual sliders, and serve warm.