Preheat your oven to 175°C (350°F). Slice the dinner rolls horizontally in half to create a top and bottom layer, then arrange the bottom halves in a baking dish cut side up.
Spread a thin layer of Dijon mustard over the cut side of each roll to add brightness and flavor.
Layer the sliced ham evenly over the mustard-covered rolls, covering all the bread surface for a savory base.
Top the ham with slices of cheese, ensuring each slider has a good amount of gooey cheese for melting.
Place the top halves of the rolls back on, gently pressing down to compact everything inside.
In a small bowl, mix the melted butter with garlic powder, herbs, and poppy seeds if using, then brush this mixture generously over the tops of the rolls for a buttery, flavorful glaze.
Bake uncovered in the preheated oven for 12-15 minutes, until the cheese is bubbly and golden, and the tops of the rolls are crispy and toasted.
Remove from the oven and let rest for 5 minutes to allow the cheese to set slightly and make slicing easier.
Use a sharp knife to cut into individual sliders, then serve warm, enjoying the crispy, cheesy, savory bites.
