Roast Beef & Cheddar Sliders

Ingredients:

12 slider buns or Hawaiian sweet rolls, sliced in half

1 lb (450 g) thinly sliced deli roast beef

12 slices sharp cheddar cheese

1/3 cup mayonnaise (optional, for spread)

1 tbsp prepared horseradish or Dijon mustard (optional for a kick)

1/4 cup (60 g) unsalted butter, melted

1 tsp Worcestershire sauce

1/2 tsp garlic powder

1/2 tsp onion powder