Yield
Makes 10 to 12 servings

How to Make It

Step 1

Cook potato in boiling water to cover 5 minutes; drain.

Step 2

Layer one-third potato slices, one-third onion slices, and one-third cheese slices in a lightly greased 13- x 9-inch baking dish. Sprinkle with 1/4 teaspoon salt and 1/4 teaspoon pepper. Repeat layers twice with remaining potato, onion, cheese slices, salt, and pepper. Top with Cheddar cheese.

Step 3

Melt butter in a heavy saucepan over low heat; add flour, whisking until smooth. Cook, whisking constantly, 1 minute. Gradually whisk in milk until smooth. Remove from heat; pour over potato mixture.

Step 4

Bake at 400° for 35 minutes or until golden. Let stand 10 minutes before serving.

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