"Tasty additions like caramelized onions and Gruyere cheese turn ordinary mashed potatoes into company-worthy Caramelized Onion Mashed Potato Bake...."
INGREDIENTS
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4 pounds baking potatoes
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2 teaspoons salt
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1 1/4 cups warm buttermilk
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1/2 cup warm milk
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1/4 cup melted butter
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1/2 teaspoon pepper
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1 teaspoon salt
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1 1/4 cups freshly grated Gruyère cheese
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1 cup chopped caramelized onion
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2 tablespoons chopped fresh parsley