Make pizza dough as directed. Place baking stone in the oven and preheat oven to 425 degrees F.
Heat oil over medium heat in a small skillet. Add bell peppers and mushrooms. Cook for about 5 minutes or until tender.
Divide dough in half and roll out each piece into 8-inch rounds. Put 1/2 cup of cheese on one half of each circle. Top each piece with pepperoni, bell peppers, mushrooms, and olives. Put remaining 1/2 cup of cheese on top of each round.
Fold over the other half of the circle and press the ends with a fork to seal.
Lightly whisk the egg and the water together. Brush the mixture over top of each calzone. Puncture a few holes in the top to allow steam to escape.
Transfer the calzones to the preheated baking stone. Cook for 12-15 minutes or until calzone is lightly brown. Serve with pizza sauce.
by The Savvy Kitchen