Heat oven to 400 degrees. Prepare pizza stone or baking sheet by dusting with cornmeal.
Roll out pizza dough to approximately 18x12 inches. It does not have to be exact.
Sprinkle the Italian seasoning and the garlic powder over the dough. Allow each family member or guest to build their own calzone by placing stuffers in the corner of one square of dough about 1/2 inch in. Top each with 1 tablespoon of mozzarella cheese (not too much) and a tablespoon of marinara sauce.
Fold dough over the tops and pinch together the seams. Using a very sharp knife, cut three one inch slits in the tops to allow the steam to escape. If you have holes, patch them using excess dough from corners.
Whisk egg yolk with a sprinkle of water and brush over the tops. Sprinkle with additional Italian seasoning.
Bake for 14-18 minutes, or until tops are lightly browned.
Heat remaining marinara sauce for dipping.
Remove calzones from oven and allow to sit for 3-5 minutes before serving. Top with marinara sauce and Parmesan Reggiano cheese. Crushed red pepper is optional for all you spice lovers!
If you've tried this recipe, come back and let us know how it was!