1-Preheat your oven to 350°F (175°C) and line a 9×9-inch or 9×13-inch pan with aluminum foil, then spray with cooking spray. Using a large serrated knife, slice the rolls in half horizontally so you have a slab of tops and a slab of bottoms without separating individual rolls. Place the bottom slab in the prepared pan and layer half the ham evenly over the rolls, followed by the cheese and the remaining ham.

2-Add the top slab of rolls on top. In a microwave-safe bowl, melt the butter on high power for about 1 minute, then whisk in the mustard, poppy seeds, dried onion, Worcestershire sauce, salt, and pepper. Pour this butter mixture evenly over the rolls and spread it with a spatula. Cover the pan with aluminum foil and let it sit at room temperature for 5 to 10 minutes to soak in the flavors.

3-Bake covered for about 20 minutes or until the cheese melts, then remove the foil and bake for an additional 3 to 5 minutes until done. For delicious results, serve immediately while warm. To adapt for special diets, like using vegan cheese, follow the same steps for a tasty variation of ham and cheese sliders.