Preheat oven to 500°F.
Dice vegetables and prepare fillings.
Roll each dough portion into 6-7 inch circles on floured surface.
Spread 1-2 tbsp marinara on one half of circle, leaving 1/2 inch border.
Layer 1-2 tbsp cheese, desired fillings, more cheese, and small dots of sauce.
Wet edges with water, fold dough over, and pinch edges firmly to seal.
Place on parchment-lined baking sheet.
Cut small vent slit in top of each calzone.
Brush with egg wash.
Bake 15-20 minutes until deep golden brown and hollow-sounding when tapped.
Cool 10 minutes before serving.
Serve with extra marinara for dipping if desired.
