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Oven Preparation: Initiate by preheating your oven to a temperature of 350 degrees Fahrenheit (approximately 175 degrees Celsius).
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Mixing the Base: In a medium-sized mixing bowl, combine the cream of chicken soup, cottage cheese, sour cream, cream cheese, Creole seasoning, onion powder, and one-half teaspoon of the garlic powder. Stir these ingredients until the mixture is uniformly smooth and thoroughly blended.
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Incorporating the Chicken: Gently fold the shredded chicken and chopped parsley into the previously prepared creamy mixture, ensuring that the chicken is evenly coated and fully integrated into the mixture.
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Preparing the Topping: In a separate medium-sized bowl, mix together the crushed crackers, melted butter, and the remaining half teaspoon of garlic powder to form the topping.
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Assembling the Casserole: Transfer the creamy chicken mixture into a baking dish measuring 11 by 7 inches or a 9-inch square dish. Ensure the mixture is spread evenly. Subsequently, sprinkle the mozzarella cheese evenly over the chicken mixture, followed by an even layer of the prepared cracker topping.
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Baking: Place the assembled casserole on a baking sheet lined with aluminum foil to catch any drippings and bake in the preheated oven. Continue to bake until the topping is golden brown and the edges of the casserole are bubbling, approximately 35 minutes.
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Garnishing and Serving: After removing the casserole from the oven, garnish with sliced scallions if desired. Allow the casserole to rest briefly before serving to ensure it is adequately set for slicing.