Preheat your oven to 350°F (175°C). This ensures that your casserole bakes evenly.
In a large mixing bowl, combine the shredded chicken, drained corn, sour cream, shredded cheddar cheese, milk, garlic powder, onion powder, salt, and black pepper. Mix everything together until well combined.
Lightly grease a 9x13 inch baking dish with cooking spray or a little olive oil to prevent sticking.
Pour the chicken and corn mixture into the prepared baking dish, spreading it out evenly.
In a separate bowl, mix the crushed butter crackers with the melted butter. Stir until the crackers are fully coated.
Sprinkle the cracker mixture evenly over the top of the casserole. This will create a deliciously crunchy crust.
Place the casserole in the preheated oven and bake for 25-30 minutes, or until the top is golden brown and the casserole is bubbly.
Once done, remove it from the oven and let it cool for a few minutes. Serve warm and enjoy the comforting flavors of your Chicken and Corn Casserole!