Preheat your oven to 180°C (350°F). Slice the dinner rolls in half horizontally and place the bottom half in your baking dish.
Layer the sliced ham evenly over the bottom buns, covering the surface completely.
Sprinkle the shredded cheddar cheese generously over the ham, ensuring a gooey, cheesy layer.
Place the top bun over the cheese layer, pressing down gently to help everything meld together.
In a small saucepan, melt the butter over medium heat. Stir in the Dijon mustard and garlic powder until well combined and fragrant.
Using a basting brush, generously apply the butter mixture over the top bun, focusing on the edges to create a golden, crispy crust.
Cover the baking dish with foil and bake for 15 minutes until the cheese is bubbly and the buns are warmed through.
Remove the foil and continue baking for an additional 5 minutes, or until the tops are golden brown and crispy.
Once baked, take the sliders out of the oven and let them rest for 5 minutes to set the cheese and avoid burns.
Use a sharp knife to cut through the sliders into individual portions if desired, revealing the melted cheese and layers inside.
Serve warm, with the cheese melted and the buns crispy at the edges, for a comforting and indulgent bite.
