ACTIVE TIME 20 MINUTES TOTAL TIME 1 HOUR, 20 MINUTES MAKES 16 CALZONES
1 small butternut squash, peeled, seeded, and cut into ½-in. pieces (about 4 cups)1 yellow onion, chopped½ cup olive oil, divided½ tsp. kosher salt, divided1 bunch Swiss chard, stemmed and chopped (2 cups)6 oz. low-moisture mozzarella cheese, shredded (about 1 ½ cups)1 cup whole-milk ricotta cheese¼ tsp. freshly ground black pepper¼ tsp. crushed red pepper3 oz. pecorino Romano cheese, grated (about ¾ cup), divided2 lb. store-bought pizza dough, at room temperatureAll-purpose flour, for work surfaceMarinara sauce, for serving
PREHEAT oven to 450°F. Toss squash, onion, 2 tablespoons oil, and ¼ teaspoon salt on a rimmed baking sheet. Spread evenly; bake until squash is just tender, 20 to 25 minutes. Stir chard and remaining ¼ teaspoon salt into…