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.
Mince the garlic and mix it with the tomato sauce, oregano, basil, and black pepper.
In a skillet, sauté the minced garlic in a little olive oil, then add the seasoned tomato sauce. Cook for 5 minutes to allow the flavors to meld.
Divide the risen dough into two equal parts and roll each into a circle, about 5 mm thick.
Spoon the tomato sauce onto one half of each dough circle, then top with sliced mozzarella and grated Parmesan cheese. Fold the other half over to enclose the filling, and press the edges firmly to seal.
Preheat the oven to 400°F (200°C). Brush the top of each calzone with beaten egg to give it a nice golden-brown color.
Place the calzones on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.
Let them rest for a few minutes before slicing, to prevent the filling from being too hot and runny.
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