1. Preheat the oven to 350°F.
  2. While the oven preheats, slice the rolls in half. Place the bottoms into a baking dish sprayed with cooking spray. Spread the mustard onto the bottom of the rolls.
  3. Place the ham in an even layer across the bottom, followed by the cheese and then the pickles.
  4. Mix the melted butter, parsley, garlic powder and onion powder together and brush on the tops of the rolls. 
  5. Cover the pan with foil. Bake at 350 degrees for 25 minutes. Remove the foil for the last 5 minutes of cooking to brown.
  6. When sliders are done, cut and serve.