Preheat the oven to 425 degrees.
Start by rolling out the pizza dough.
Start placing the Italian Sub ingredients onto one side of the dough. Layer the ham, salami, pepperoni, swiss cheese, pepperoncini's, diced tomatoes, swiss, and mozzarella cheese. Pour the Italian dressing over the top, splitting between the two.
Start by folding the pizza crust over the filling.
Peel down the parchment paper and repeat the process until the pizza crust is all rolled up and the filling is completely rolled up into the pizza crust.
Crimp the end of the pizza crust to seal the stromboli completely.
Whisk an egg then brush on top of the crust.
Using a knife, make 5-6 cuts on top of the crust so the heat can escape while baking.
Sprinkle with garlic powder and Italian seasoning.
Place in the oven and bake for 20 minutes.
Remove the Italian Sub stromboli from the oven. Slice and serve with prepared pizza sauce. Enjoy!