Caramelized tangy onions and melty cheese top these easy to make Roast Beef Sliders for any game day party that will have everyone coming back for more! Nothing beats a bite sized snack for Super Bowl Party Food like these Roast Beef sliders!
Preheat oven to 350°
In a skillet heated to medium, melt the 2 tablespoons butter. Then add the onions and cook on low for about 10 minutes until golden brown and caramelized. Remove from heat to assemble sandwiches.
Cut the entire 24 roll package of rolls in half so that the bun top is on one side and the bottoms on the other.
Onto the bottom half, layer the roast beef, then cheese, then spoon caramelized onions evenly over the top of that. You may want to use a spoon in case the onions are too warm to handle.
If you are making the sandwiches ahead of time, make until this step and place in fridge until you are ready to bake. Remove from fridge at the time you preheat your oven and make the butter mixture as stated below.
In a microwave safe bowl, melt the butter for 30 seconds at a time until completely melted. Then add rum, sugar, Worcestershire and mustard and stir well. You will stir until the sugar is completely dissolved into the butter.
Spread about half of the butter mixture on the inside of the bun tops. Place bun top over the bottom section and place into a baking dish. Brush the remaining butter mixture over the top and sides of the sliders in the baking dish.
Cover completely with Foil.
Bake for 15 minutes covered until cheese is completely melted. Uncover and bake for 5 minutes more.
Cut sliders into 24 pieces using the individual rolls as guidelines and serve immediately.