INGREDIENTS
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6 medium yellow onions, trimmed, peeled, and halved pole to pole
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3 tablespoons olive oil, divided
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3/4 teaspoon kosher salt, divided
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1/4 teaspoon freshly ground black pepper
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12 ounces frozen sweet Italian sausage (about 3 links), defrosted, casings removed
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1/2 cup chopped parsley leaves, plus more for serving
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1 cup Panko, divided
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4 ounces grated white Cheddar (about 1 cup), divided