In a large bowl, combine the flour, dry yeast, and salt. Add the olive oil and lukewarm water, then 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.
While the dough is rising, prepare the vegetables: slice the mushrooms, bell pepper, and zucchini, then mince the garlic.
In a skillet, heat a little olive oil and sauté the vegetables over medium heat for 5-6 minutes, until slightly softened.
Mix the ricotta cheese with the grated mozzarella, basil, and oregano. Add the sautéed vegetables.
Divide the risen dough into two equal parts, then roll each part into a circle about 5 mm thick.
Spread tomato sauce on one half of each circle, then top with the vegetable and cheese mixture. Fold the other half over 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 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.
Let it cool for a few minutes before slicing, so the filling doesn't spill out too hot.
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