Preheat your oven to a toasty 350°F (175°C) while you gear up for a sandwich assembly that’s as fun as it is straightforward.
Begin by cutting a pack of sweet Hawaiian rolls in half, ensuring they still cling together like best buds. Lay the bottom half in a well-greased baking dish.
Spread the roast beef slices over the rolls like a blanket, followed by a layer of Swiss cheese to add depth and richness.
Cap off the build with the top half of the rolls. This simple act of sandwiching is where the magic starts.
Whisk together melted butter, mayonnaise, Dijon mustard, Worcestershire sauce, poppy seeds, dried minced onions, and garlic powder. When this luscious mixture is drizzled over the rolls, it transforms them into a flavor-packed ensemble.
Cover with foil and bake until the cheese turns into a gooey delight, which should take about 20-25 minutes.
Once baked, let these aromatic treasures cool slightly, then slice them along the rolls' seams to serve. The result? A warm, savory mouthful of joy.