Step 1

Preheat oven to 375°F. Lightly spray an 11- x 7-inch baking dish with cooking spray. Split rolls horizontally (without separating into individual rolls); place bottom halves of rolls in prepared baking dish.

Step 2

Cover bottom halves of rolls with 3 slices Gruyère cheese, cutting slices to fit in an even layer. Add turkey slices, folding to fit evenly on Gruyère. Place tomato slices in an even layer on turkey. Top evenly with bacon pieces. Add remaining slices of Gruyère, cutting to fit, in an even layer on bacon. Sprinkle evenly with Parmesan. Cover with top halves of rolls.

Step 3

Stir together melted butter, Dijon mustard, minced onion, Worcestershire, brown sugar, garlic, and hot sauce in a 2-cup liquid measuring cup. Slowly pour mixture over rolls in baking dish, allowing it to soak into rolls. Cover dish with aluminum foil, and bake in preheated oven until cheese is melted, about 15 minutes. Uncover, and continue baking until tops are golden brown and crisp, 8 to 10 minutes. Remove from oven; let stand 5 minutes before serving. Serve hot sandwiches from the baking dish