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PREHEAT oven to 400°F. Cut a 1/2-inch-thick slice from top of bread loaf; remove center of loaf, leaving 1-inch-thick shell. Reserve removed bread for another use. Spread inside of bread shell and cut-side of top of loaf with dressing and mustard.
FILL bread shell with layers of turkey, spinach, onions and cheese; cover with top of bread loaf. Wrap in aluminum foil.
BAKE 30 min. or until cheese is melted and sandwich is heated through. Let stand 10 min. Cut into 4 wedges with serrated knife. Serve warm.