"A one-skillet wonder that hits all the comfort food notes...."
INGREDIENTS
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2 pounds yellow onions (about 2 large or 4 medium)
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1 small bunch fresh thyme, divided
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2 tablespoons olive oil, divided
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2 (16- to 18-ounce packages) fresh, shelf-stable, or frozen potato gnocchi (do not thaw)
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2 tablespoons unsalted butter
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1 teaspoon kosher salt, plus more as needed
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1/2 teaspoon freshly ground black pepper, plus more for serving
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6 ounces Gruyère cheese
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1/4 cup dry white wine
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1 teaspoon balsamic or sherry vinegar