Preheat oven to 350°F. Stir together cream of chicken soup, cream cheese, cottage cheese, sour cream, onion powder, and garlic powder in a large bowl until well combined.
Prepare the scallions:
Thinly slice scallions; separate white and light green parts from dark green parts. Set aside until ready to use.
Add scallions, chicken, and parsley:
Fold white and light green parts of scallions, chicken, and parsley into cottage cheese mixture until evenly coated.
Make cracker topping:
In a medium bowl, stir together crackers, butter, and thyme until well coated. Set aside.
Add casserole to dish:
Spoon chicken mixture evenly into an ungreased 11- x 7- inch baking dish. Sprinkle evenly with cracker mixture.
Bake casserole:
Make creamy casserole filling:
Bake in preheated oven until edges are bubbly and crackers are golden brown, 30 to 35 minutes. Garnish with dark green parts of scallions, and serve over rice.
