For the dough, combine the flour, yeast, salt, and sugar in a large bowl. Add the warm water and olive oil, and knead until you have a smooth, elastic dough.
Cover the dough with a clean kitchen towel and let it rise for 1 hour, or until doubled in size.
Meanwhile, prepare the filling: mince the garlic, then sauté the spinach in a pan with a little olive oil until wilted.
Combine the ricotta cheese, grated mozzarella, Parmesan, oregano, and chopped basil, then add the sautéed spinach.
Preheat the oven to 430°F (220°C).
Divide the risen dough into two portions, then roll each portion into a circle approximately 10 inches (25 cm) in diameter.
Pile the spinach and cheese filling onto one half of each circle, then fold the other half over the filling and press the edges together to seal well.
Brush the top of the calzones with beaten egg, then place them on a baking sheet lined with parchment paper.
Bake in the preheated oven for 15-20 minutes, or until golden brown.
Let cool for a few minutes, then serve garnished with fresh basil.
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