Gratin of Two Potatoes

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Ingredients

• 2 large baking potatoes (about 1 1/4 pounds)
• 2 large sweet potatoes (about 1 1/4 pounds)
• 1 tablespoon unsalted butter
• 1 large sweet or yellow onion, thinly sliced and separated into rings
• 2 teaspoons all-purpose flour
• 1 cup canned chicken broth
• 1/2 teaspoon salt
• 1/4 teaspoon white pepper
• 3/4 cup freshly grated Parmesan cheese

Directions

• 1
  Place baking potatoes in a large saucepan with water to cover and bring to a boil; boil 10 minutes. Add sweet potatoes; return to a boil. Simmer, uncovered, until tender, about 25 minutes. Drain; cool potatoes under cold running water.
• 2
  Melt butter in nonstick skillet over medium-low heat. Add onion and cook until tender, 10 to 13 minutes, stirring occasionally. Add flour; cook 1 minute, stirring frequently. Add chicken broth, salt and pepper. Bring to a boil over high heat. Reduce heat and simmer until the sauce thickens, about 2 minutes.
• 3
  Preheat oven to 375F. Grease 13x9-inch baking dish with butter. Peel potatoes; cut crosswise into thin slices. Layer half of baking and sweet potato slices in prepared dish. Spoon half of onion mixture evenly over potatoes. Repeat layering. Cover. Bake until heated through, about 25 minutes.
• 4
  Preheat broiler. Uncover potatoes; sprinkle evenly with Parmesan. Broil until Parmesan is bubbly and golden brown, about 5 minutes.