In a large bowl, combine the flour, yeast, and salt. Add the olive oil and lukewarm water, and knead until you have a soft, but not sticky dough. If it's too dry, add a little more water.
Cover the dough with a clean kitchen towel and let it rise in a warm place for about an hour, or until doubled in size.
Peel the sweet potato, cut it into small cubes, and cook in salted water for 10-12 minutes, or until tender. Then, mash and let it cool completely.
Mince the garlic and mix it with the sour cream, black pepper, and oregano.
Divide the risen dough into two equal parts, then roll each part into a circle about 5 mm thick.
Spoon the sweet potato puree onto one half of each dough circle, then sprinkle with grated mozzarella and Parmesan cheese.
Fold the other half of the dough over the filling, and press the edges firmly to seal. This will prevent the filling from leaking out.
Preheat the oven to 400°F (200°C). Brush the top of each calzone with beaten egg to give it a beautiful golden-brown color.
Place the calzones on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.
Wait a few minutes before slicing to prevent the filling from being too hot and runny.
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