01 -
Set your oven to 350℉. Line a baking sheet with parchment paper or foil, or just grease a 9x13-inch dish with non-stick spray.
02 -
Grab a bread knife and carefully separate the Hawaiian rolls so there's a top and bottom half.
03 -
Combine garlic powder or paste with the mayo, then spread it evenly across the cut side of the bottom rolls.
04 -
Add a layer of roast beef and top with cheese slices. Put the top section of rolls back on.
05 -
Melt the butter in a saucepan or microwave. Stir in mustard, Worcestershire sauce, and brown sugar. Brush this mixture over the roll tops, then sprinkle with poppy or sesame seeds if you'd like.
06 -
Cover the dish with foil and put it in the oven for 20 minutes. Take off the foil and let it bake another 5 minutes until the tops look golden.
07 -
Let the sliders cool a bit. Move them onto a cutting board, slice into individual sandwiches, and sprinkle on Parmesan and parsley if you're using them.