Heat the oven to 350°F. Slice the rolls in half without separating them.

Layer the ham and cheese on the bottom halves, then replace the tops.

Mix the melted butter, mustard, and poppy seeds. Brush it over the rolls.

Cover with foil and bake for 15 minutes. Remove the foil and bake 3 to 5 minutes more.

Cool the sliders, wrap them individually, and freeze.

To serve, microwave one wrapped slider for 60 to 90 seconds, checking the center before eating.