Preheat oven to 350°F. Grease a 9”x13” baking pan.
Slice the slider buns in half, placing the bottom portion of each roll neatly in the baking dish.
In a small bowl, mix together the mustard, Worcestershire sauce, garlic powder, and onion powder. Spread the mixture evenly over the slider bottoms in the baking pan.
Evenly distribute the roast beef onto the sliders.
Top with the cheese slices, then place the tops of each bun on the sliders.
Brush melted butter over the tops of the sliders.
Cover with aluminum foil and bake for 20 minutes, then uncover and bake an additional 5 minutes, browning the tops of the sliders. Serve!
Notes
When choosing a roll, the sturdier the better! This prevents the bottoms of the sliders from becoming soggy while baking.
Provolone, Havarti, or pepper jack cheese slices all work great instead of the white cheddar cheese!
After baking, it helps to cut the sliders away from each other to make them easier to serve.