Stromboli is everything delicious about pizza and a calzone combined. Rolled inside pillowy pizza dough, there’s a layer of tomatoes and a hearty spinach-mushroom filling. Cheese helps the filling and dough stick together, so don’t skimp on the mozzarella. Cooking the stromboli on a pizza stone ensures even browning on top and bottom of the dough. No pizza stone? No problem. Just assemble the stromboli on a parchment-lined baking sheet. If you have a favorite local pizzeria, sometimes they’ll sell you fresh dough. Make sure to ask for a one-pound ball, which is the amount you’ll need for this recipe.
Preheat oven to 425°F with rack in lowest position. Heat oil in a large skillet over medium-high. Add mushrooms, onion, salt, pepper, and oregano and cook, stirring, until vegetables are tender, 8 to 10 minutes. Add spinach and garlic and cook, stirring, until spinach has wilted, about 3 minutes. Transfer to a bowl and let cool slightly.
On a lightly floured piece of parchment, roll dough into a 10-by-15-inch rectangle. Spoon mushroom mixture length-wise down center of dough and top with tomatoes and cheese. Brush edges with egg and roll away from you into a log, pinching edges to seal. Place seam side down and transfer dough and parchment to a rimmed baking sheet. Brush with egg and cut 4 slits along the top. Bake on lowest rack until golden brown, 15 to 18 minutes. Let cool 15 minutes before slicing.
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