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 into two equal halves.
Mash the cooked potatoes with a fork, then mix in the finely chopped garlic, salt, and pepper.
Slice the smoked sausage thinly, then mix it with the potato mixture.
Spread the sour cream evenly over one half of each dough portion, then distribute the potato and sausage filling on top.
Grate the mozzarella cheese and sprinkle it over the filling.
Fold the other half of the dough over the filling. Press the edges together with a fork to seal the calzone tightly.
In a small bowl, whisk the egg, then brush it over the top of the calzone to help it brown beautifully.
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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