"A sprinkle of Parmesan and thyme adds a unique twist to this savory sweet potato gratin...."
INGREDIENTS
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1 tablespoon butter, softened
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1 cup thinly sliced sweet onion
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2 pounds sweet potatoes (about 3 large), peeled and thinly sliced
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1 tablespoon all-purpose flour
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1 teaspoon chopped fresh thyme
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1/2 teaspoon kosher salt
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1/2 teaspoon freshly ground black pepper
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2 ounces grated fresh Parmesan cheese (about 1/2 cup), divided
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Cooking spray
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1/2 cup organic vegetable broth