INGREDIENTS
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Favorite pie crust for 1 9-inch pie
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1 Tablespoon olive oil
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1 cup thinly sliced leek (about 1 large)
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¼ teaspoon black pepper
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1 medium peeled baking potato, halved lengthwise and cut into ¼-inch-thick slices (about 1 cup)
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1 cup fat-free milk
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3 eggs
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⅓ cup (1½ ounces) grated Gruyère or Swiss cheese
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2 tablespoons grated fresh Parmesan cheese
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1 tablespoon Dijon mustard