Pre-heat oven to 400°F.
Lightly grease an 8-inch square glass baking dish with cooking spray.
Spread half of the stuffing in an even layer in bottom of prepared baking dish.
Spread half of the cranberry sauce, in an even layer, over stuffing.
Layer half of turkey slices on top of the cranberry sauce, then spread half of the mashed potatoes on top of the turkey.
Sprinkle half of the shredded cheese on top of the potatoes; repeat layers one more time.
Bake in pre-heated oven until lasagna is warmed through; about 20 minutes.
Change oven to broil, and broil until cheese is golden; about 2 minutes.
Remove from oven, and let stand 5 minutes before cutting into 9 squares.
Re-heat gravy on stovetop or microwave.
Spoon gravy over each square; serve.