Preheat Oven: Preheat oven to 375°F (190°C) and line a baking sheet with parchment paper.
Prepare Dough: Roll pizza dough into a large rectangle on a lightly floured surface. Spread Dijon mustard thinly over the dough, if using.
Layer Filling: Evenly layer ham, cooked chicken, Swiss cheese, Parmesan, garlic powder, and onion powder over the dough.
Roll Stromboli: Roll dough tightly from the long side into a log, tucking in the ends to seal. Place seam-side down on the prepared baking sheet.
Egg Wash & Venting: Brush with beaten egg and cut small slits on top for steam to escape during baking.
Bake: Bake for 25–30 minutes, until golden brown.
Finish: Brush with melted butter immediately after baking. Let rest 5 minutes before slicing into thick pieces.
Serve: Serve warm with ranch, honey mustard, or your favorite dipping sauce.
Serving and Storage Tips
