For the sandwiches:
24 Hawaiian rolls
24 slices of Roast Beef
24 slices Swiss cheese
For the sauce:
4 teaspoons of dijon mustard
4 Tablespoons of melted butter
2 teaspoons of onion powder
½ teaspoon of Worcestershire sauce
1 Tablespoon of poppyseeds
Preheat the oven to 350˚F.
Cut he Hawaiian rolls in half.
Fold a slice of roast beef in half to fit on each Hawaiian roll, and the top with a slice of Swiss.
Return the top bun to the sandwich.
Repeat with all the remaining sliders.
Place the sandwiches in a baking pan, 12 in each.
Combine the mustard, butter, onion powder and Worcestershire sauce.
Drizzle the sauce over the tops of the slider buns. Sprinkle generously with poppy seeds.
Cover your pan loosely with tin foil and bake for 10-12 minutes. Remove the tin foil about 8+ minutes in.