In a large bowl, combine the flour, yeast, and salt. Add the olive oil and lukewarm water, and knead until a soft, but not sticky, dough forms. 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.
While the dough is rising, dice the bell pepper and ham into small cubes, then mince the garlic.
Heat a little olive oil in a skillet over medium heat, then sauté the garlic, bell pepper, and ham for 4-5 minutes, until slightly softened.
Mix the tomato sauce with the oregano and basil, then add the sautéed vegetables, corn, and spices.
Divide the risen dough into two equal portions, then roll each out into a circle, about 5 mm thick.
Spoon the ham, corn, and tomato sauce filling onto one half of each dough circle, then crumble the feta cheese and sprinkle the grated mozzarella over it. Fold the other half over the filling and press the edges firmly to seal, ensuring the filling doesn't leak.
Preheat the oven to 400°F (200°C). Brush the top of each calzone with beaten egg to achieve 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 running out while it's too hot.
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