Preheat oven to 350F degrees. Spray a 2.5 quart baking dish (or a 9x9 square baking dish) with non-stick cooking spray.
In a large bowl, mix together 10.5 ounce can condensed cream of chicken with herbs soup, 1 cup sour cream and ½ cup sliced green onion.
Then stir in 3 cups cooked and shredded chicken. Spread mixture into the prepared dish.
In that same bowl, combine 2 sleeves Ritz crackers, crushed with ½ cup (1 stick) salted butter, melted.
Sprinkle the cracker mixture over the casserole.
Bake for about 25-30 minutes until the cracker topping is golden brown and the casserole is bubbly.
