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PREP: Adjust rack to middle position and preheat oven to 450 degrees. Coat a 9-by-13-inch baking dish with nonstick cooking spray. Finely dice celery. Halve, peel, and mince onion. Pick sage leaves from stems; finely chop until you have 2 TBSP. Strip thyme leaves from stems; finely chop leaves until you have 1 TBSP. (Save remaining herbs for Classic Gravy!) Halve buns, then cut into 1-inch cubes.