Preheat the oven to 400°F (200°C). If using store-bought pizza dough, let it rest at room temperature for 10 minutes to make it easier to roll out.
On a lightly floured surface, roll out the pizza dough to about 1/8 inch (3-4 mm) thickness. Shape it into a large circle, then cut it in half.
In a bowl, combine the tomato sauce with the minced garlic, oregano, salt, and pepper.
Finely chop the capers and black olives, then mix them into the tomato sauce.
Grate the mozzarella and mix it with the Parmesan cheese.
Place the filling on one half of each dough circle, then fold the other half over to cover. Use a fork to press down the edges, sealing the calzone tightly.
In a small bowl, whisk the egg, then brush it over the top of the calzone to help it turn golden brown during baking.
Place the calzone on a baking sheet lined with parchment paper and bake for 15-18 minutes, or until golden brown.
After baking, let it cool slightly, then drizzle with a little olive oil and serve warm.
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