Preheat the oven to 350°F (175°C). Lightly grease a 9x13 inch baking dish.
In a large bowl, combine the shredded chicken, cream of chicken soup, and sour cream until smooth. Spread evenly into the prepared baking dish.
In a separate bowl, mix the crushed crackers with melted butter until coated. Sprinkle the buttery cracker mixture evenly over the chicken layer.
Place in the oven and bake for about 30 to 35 minutes or until hot and bubbly with a golden brown topping.
Let cool for 5 minutes before serving.
Notes
For variations, you can use cooked shredded turkey instead of chicken, cream of mushroom soup, or Greek yogurt instead of sour cream. You can add cooked veggies for extra nutrients.