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.
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.
Clean and slice the mushrooms. Finely chop the onion.
In a skillet, heat the olive oil over medium heat. Sauté the chopped onion until translucent.
Add the minced garlic and sliced mushrooms, then sauté for 5-6 minutes, until the mushrooms release their liquid and soften.
Pour in the heavy cream, season with salt, pepper, and dried tarragon. Cook for 2-3 minutes, until slightly thickened.
Grate the mozzarella cheese and stir it into the mushroom mixture.
Place the filling on one half of the dough, then fold the other half over. Use a fork to press down the edges to seal the calzone tightly.
In a small bowl, whisk the egg, then brush it over the top of the calzone to help it bake to a beautiful golden brown.
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 sprinkle with grated Parmesan cheese before serving.
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