Line a 9×13 pan with foil. Preheat oven to 350 degrees.
Cut the rolls in half.
Layer with turkey, apples (leave the peel on), cheese, and spread the sauce or mustard on the other side of the buns.
Place the top layer of buns on top. Cover again with foil.
Bake for 20-25 minutes. Don’t forget the last step: Remove the foil, rub the top of the sliders with butter, and bake an additional 5 minutes, to get the top of the buns toasty!