01 -
Preheat oven to 500°F. Spray 13x9-inch baking dish with cooking spray.
02 -
Combine mayonnaise, sour cream, parmesan cheese, pepper and garlic salt.
03 -
Pack baking dish with spinach, top with uncooked chicken breasts, spread with creamy sauce mixture.
04 -
Sprinkle with Monterey Jack cheese. Bake on bottom rack for 20-25 minutes until chicken is cooked and spinach shrinks.