Mix the Caesar dressing, sour cream, and 1/2 cup of the Parmesan together until well combined.
Spread the dressing mixture on top of the chicken, then sprinkle with the remaining Parmesan cheese.
Cover the pan with foil and freeze.
Alternatively, you can place all ingredients except the cheese into a large freezer bag. Squish around to coat the chicken evenly.
Place the cheese in a medium freezer bag. Remove excess air, seal and staple both bags together above the seal line.
Thaw.
Preheat the oven to 375°.
If using the bag method, place chicken and sauce on a baking sheet and sprinkle the cheese on top.
Bake for 45-50 minutes.
If desired, broil for 3 minutes at the end until the sauce and cheese on top is golden brown. Watch carefully to prevent burning.
*I prefer to use the Caesar dressing in a jar rather than a bottle. These can usually be found in the produce aisle of the grocery store.