Sift the flour into a large mixing bowl, add the salt, and stir to combine. This helps achieve a consistent dough texture.
Dissolve the yeast in the lukewarm water, then add it to the flour. Pour in the olive oil and start to mix the dough.
Knead the dough until it is smooth and elastic. If it is sticky, add a little flour, but not too much, as it may dry out the dough.
Place the dough in a lightly oiled bowl, cover, and let it rise for about 1 hour, or until doubled in size.
Cut the bell pepper and zucchini into thin slices. In a skillet, sauté the vegetables in a little olive oil over medium heat, then add the minced garlic and Herbes de Provence.
Crumble the feta into smaller pieces and add it to the sautéed vegetables, then let it cool.
Punch down the risen dough on a floured surface, then divide it into 4 equal parts and roll each one into a circle.
Thinly spread the tomato sauce over half of each dough circle, being careful to leave the edges free.
Spoon the Herbes de Provence-seasoned vegetables onto the tomato sauce base, then sprinkle with the grated mozzarella.
Fold the dough in half, press down the edges, then use a fork to seal them well so that they do not open during baking.
Place the calzones on a baking sheet lined with parchment paper, then brush with beaten egg to give them a beautiful golden-brown color.
Bake in a preheated oven at 400°F (200°C) for about 20-25 minutes, or until golden brown.
Let the finished calzones rest for a few minutes, then serve warm.
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