Part 5/7:
Place the stromboli on a parchment-lined baking sheet and gently tuck the edges underneath for a tidy finish. Cover it loosely with plastic wrap and let it rest for 30 minutes while your oven preheats to 400 degrees Fahrenheit.
The Finishing Touch: Egg Wash and Seasoning
As you await the oven, prepare an egg wash by cracking one egg into a bowl, adding a tablespoon of water, and mixing thoroughly. Brush this mixture over the surface of the dough to give it a beautiful sheen once baked.
Sprinkle some coarse or kosher salt and garlic powder on top to enhance flavor, followed by additional Parmesan cheese. Before baking, make four diagonal slits on top of the stromboli to allow steam to escape, ensuring a perfectly cooked result.