INGREDIENTS
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Nonstick cooking spray
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2 tablespoons olive oil
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5 cups sliced onion
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3 tablespoons dark brown sugar
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1/4 teaspoon cayenne pepper
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1/3 cup butter
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3 tablespoons all-purpose flour
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2 cups half-and-half
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1 teaspoon Dijon mustard
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1/2 teaspoon smoked paprika
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1/2 teaspoon ground black pepper
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1 1/2 teaspoons salt
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3 pounds peeled, very thinly sliced sweet potato
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2 cups grated Parmesan
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2 tablespoons chopped fresh parsley, optional