In a large bowl, combine the flour, salt, sugar, and active dry yeast. Add lukewarm water and olive oil, then knead into a soft, elastic dough. If the dough is too sticky, add a little flour; if it's too dry, add a little water.
Cover the dough and let it rise in a warm place for about 1 hour, or until doubled in size.
Meanwhile, prepare the filling: cut the bacon into small pieces, then cook in a skillet until crispy. Set aside to cool.
In a bowl, mix together the sour cream, minced garlic, and oregano. Grate the mozzarella cheese.
Turn the risen dough out onto a floured surface, then divide it into four equal portions. Roll each portion into a circle about 3 mm thick.
Spoon the garlic sour cream onto one half of each dough circle, then sprinkle with crispy bacon and grated mozzarella. Be sure to leave about 1 cm of space around the edges for folding.
Fold the dough in half to create a half-moon-shaped calzone. Press the edges firmly to seal, then crimp with a fork to prevent it from opening during baking.
Brush the top of each calzone with a beaten egg for a golden-brown finish after baking.
Bake in a preheated oven at 400°F (200°C) for about 20 minutes, or until the calzone are nicely golden brown.
Let cool slightly, then serve fresh, optionally with extra sour cream or a garlic dipping sauce.
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