Preheat your 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.
Slice the leeks into thin rings. In a skillet, sauté the leeks in olive oil over medium heat until softened.
Add the minced garlic and sauté for another minute until fragrant. Pour in the heavy cream. Stir to combine, season with salt, pepper, and nutmeg. Cook for 2-3 minutes, or until the sauce has slightly thickened.
Grate the mozzarella cheese and stir it into the creamy leek mixture.
Place the filling on one half of each dough circle, then fold the other half over the filling. Use a fork to crimp the edges to seal the calzone.
In a small bowl, whisk the egg and 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, drizzle with a little olive oil, and serve warm.
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