• Preheat the oven to 350°F.

Sliders:

• Leave the slider buns intact, and slice them in half lengthwise. Place the bottom half of the buns into a 9 x 13-inch baking dish. 
  12 slider buns
• Lay the cheese slices over the buns, then top with the onions and sliced roast beef. Place the tops of the buns onto the sliders. Set aside.
  8 ounces provolone cheese, 1 pound roast beef, ½ cup white onions

Sauce:

• In a small saucepan over low heat, melt the butter. Stir in the Worcestershire sauce, mustard, garlic powder, onion powder, and seasoned salt. Pour the mixture over the sliders.
  ½ cup unsalted butter, 1 tablespoon Worcestershire sauce, 1 teaspoon Dijon mustard, ½ teaspoon garlic powder, ¼ teaspoon onion powder, ¼ teaspoon seasoned salt
• Bake uncovered for 10 to 15 minutes until the cheese is melted and the tops are golden brown.
• Use a sharp knife to separate the sliders. Serve hot with a side of au jus.
• See post for storage recommendations.