Cover the toaster oven baking sheet with aluminum foil. Set aside.
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On the wire rack of the toaster oven, lightly toast the halved English muffinsóin batches, if necessary.
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Using oven mitts or pot holders, remove the English muffins from the toaster oven and place on the covered baking sheet in one layer, cut side up.
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Divide the tuna salad evenly among the toasted muffin halves.
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Top each half with 2 slices of the Cheddar cheese (or 1 slice of the American cheese).
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Return the baking sheet to the toaster oven and broil until the cheese is melted and bubbly, about 3 minutes.
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Using the mitts or pot holders, remove from the oven and serve.
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Yield: 3 or 6 servings
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This tuna salad tastes just as good on regular, untoasted bread.