Preheat oven to 400 degrees F. Slice the dinner rolls in half and place them cut side up on a large baking tray.
To make the sauce, whisk together the sauce ingredients and spread about 1 tsp of sauce on each half.
Place a slice of ham, draped and folded, into a pile, on one half of each roll. Place a half slice of cheese over the ham. Layer a slice of chicken, again draped and folded into a pile, over the cheese. Place the second half slice of cheese over the chicken. Divide any remaining cheese between the rolls and place the top roll over each slider.
Combine the melted butter, garlic powder and parsley in a small dish and brush over the tops of the rolls. Bake the sliders for 5 to 6 minutes, until the cheese has melted. Remove from the oven and serve with extra honey mustard sauce, if desired. Enjoy!