Preheat oven to 350°F. Spray a 12 ct muffin pan with nonstick spray.
Mix cold stuffing mix with raw egg until the egg is fully incorporated. Equally divide the stuffing mixture into each of the muffin tins pressing down in the center to form a nest. Fill each tin about 2/3 of the way full. You may not need all of the stuffing.
Top each of the stuffing cups equally with chicken. Spoon approximately 1 1/2 tbsp of gravy over top of each stuffing cup. Sprinkle cheese over each one.
Bake uncovered for 15-20 minutes or until cheese is melted. If the stuffing begins to brown too quickly, feel free to cover with tin foil.
Let sit for 5 minutes after cooking.
Remove carefully so as to make sure the stuffing cups don't fall apart. Serve and enjoy!