Preheat the oven to 350ºF. Lightly coat a 9×9-inch baking dish with cooking spray and set it aside.
In a mixing bowl, stir together the chicken, cream cheese, cottage cheese, sour cream, garlic powder, onion powder, and cream of chicken soup until well combined. Spread the mixture evenly in the prepared baking dish.
In a separate bowl, mix the crushed crackers with the melted butter. Sprinkle the topping evenly over the chicken mixture.
Bake uncovered for 30 to 40 minutes, until the casserole is hot and bubbly.
Notes
Texture Tip: Use room temperature cream cheese for the smoothest filling. Cold cream cheese can leave lumps behind.Watery Casserole Fix: Drain any excess liquid from the cottage cheese and make sure the cooked chicken is not wet before mixing.Make-Ahead Tip: Assemble the filling up to 2 days in advance, but wait to add the cracker topping until just before baking so it stays crisp.Freezing Tip: Freeze the casserole before baking and without the topping for the best texture. Thaw overnight in the refrigerator, then add fresh topping and bake.Serving Tip: Let the casserole rest for 10 to 15 minutes after baking for cleaner scoops and a thicker filling.Some nutrition values may be estimated when exact source data is unavailable.