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Preheat the oven to 350°F.
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Line a 10"x15" rimmed baking sheet with aluminum foil, then coat the foil with nonstick cooking spray.
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Whisk together the eggs, milk, flour, salt, and pepper for 2 to 3 minutes, or until the mixture is smooth.
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Stir in the scallions, then pour the mixture onto the baking sheet.
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Bake for 12 to 15 minutes, or until set.
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Sprinkle evenly with the cheese, then bake for 2 to 3 minutes, or until the cheese is melted.
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Allow to cool for 5 minutes, then carefully lift the aluminum foil (eggs and all) and remove it from the baking sheet.
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Starting from a smaller end, roll up the eggs jellyroll style, carefully releasing them from the aluminum foil as you roll.
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Slice into 1-inch pieces and serve.