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Preheat the panini press or grill. If you do not have a press you can make this like a traditional grilled cheese sandwich in a frying pan.
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Spread the outer side of each slice of bread with butter
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Spread the mustard evenly over two slices of bread on the opposite side as the butter.
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Layer the apple slices, cheese and turkey on top of the mustard.
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Top each with the remaining bread slices.
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Grill each sandwich for 3 to 5 minutes or until bread is golden brown and cheese has melted. Remove from pan, cut in half and serve immediately and enjoy!