1. Prepare the Rolls and Oven: Preheat your oven to three hundred fifty Fahrenheit. Using a serrated knife, carefully slice the entire package of sweet rolls horizontally, keeping them connected. Place the bottom half into a nine-by-thirteen inch baking dish.

2. Apply the Mustard Base: Gently spread the yellow mustard evenly across the bottom layer of the rolls. This step provides a crucial layer of tanginess that cuts through the richness of the ham and cheese.

3. Layer the Fillings: Arrange the sliced ham over the mustard in an even layer. Top the ham with the slices of Swiss cheese. Place the top half of the rolls back on, completing the sandwiches.

4. Craft the Glaze: Melt the butter in a small saucepan or microwave-safe bowl. Stir in the Worcestershire sauce, poppy seeds, dried minced onion, salt, and pepper until well combined.

5. Pour and Drench: Slowly and evenly pour the entire butter mixture over the tops of the assembled rolls. Ensure the glaze covers the rolls and drips down slightly along the sides.

6. Allow a Soak (Optional but Recommended): Cover the dish tightly with aluminum foil and let the sliders rest for about ten minutes at room temperature. This brief soaking time allows the glaze to really penetrate the rolls.

7. Bake to Perfection: Bake, covered, for fifteen minutes. Remove the foil and continue baking for an additional five to ten minutes, or until the cheese is bubbling and the tops of the rolls are golden brown and toasted.

8. Serve: Carefully remove the dish from the oven. Let it cool for just a couple of minutes before using a sharp knife to cut the sliders apart along the roll seams. Serve immediately while warm and gooey.