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1
Heat a panini or sandwich press according to the manufacturers instructions.
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2
Combine the chicken and barbecue sauce, if using, in a small bowl and stir to coat.
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3
Make the blue cheese dressing: Combine the mayonnaise, sour cream, blue cheese, and scallion in a small bowl and stir to combine.
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4
Season with salt and pepper.
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5
Slice the rolls in half and spread some blue cheese dressing on the inside of each roll.
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6
Arrange the sliced celery on the bottom halves of the rolls.
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7
Pile the chicken on top of the celery.
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8
Top each sandwich with the top half of the roll
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9
Put the sandwiches on the press, pull the top down, and cook until they are brown and crisp, 4 to 7 minutes, depending on how hot your machine is.
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10
Carefully remove from the press and serve immediately.
