Put an oven rack in the center of the oven. Preheat the oven to 450 degrees F.
On a lightly floured work surface, roll out the dough into a 13-inch diameter circle, about 1/4-inch thick. Transfer the dough to a heavy baking sheet dusted with cornmeal.
In a medium bowl, combine the cheeses, salami, peppers, olives, and 1/4 cup olive oil. Put the cheese mixture on 1 side of the dough leaving a 1-inch border. Using a pastry brush, lightly brush the edges of the dough with the beaten egg. Fold the unfilled side of the dough over the filling and using the tines of a fork, press the edges of the dough together to seal. Drizzle with olive oil. Using a paring knife, cut a 1/2-inch wide slit in the top layer of the dough. Bake until golden brown, about 20 to 25 minutes. Remove from the oven and let cool for 5 minutes. Cut the calzone into slices and serve with warm marinara sauce, if desired.
Put a wedge of fontina cheese in the freezer for 15 to 20 minutes to make shredding easier.
Recipe courtesy of Giada De Laurentiis