In a large mixing bowl, combine the softened cream cheese, sour cream, and cream of chicken soup until smooth and well blended.
Stir in the shredded chicken, shredded cheddar cheese, green onions, garlic powder, onion powder, frozen mixed vegetables, and season with salt and pepper. Mix until incorporated.
Spread the chicken mixture evenly into a greased 9x13-inch baking dish.
In a separate bowl, combine the crushed crackers with melted butter, mixing until the crackers are evenly coated.
Sprinkle the buttery cracker mixture over the chicken casserole evenly.
Bake in the preheated oven for 30-35 minutes, or until the casserole is bubbly and the top is golden brown.
Remove from the oven and let sit for about 5 minutes before serving.
Garnish with fresh parsley if desired for an added touch of color.
Notes
Serve in individual bowls, garnished with additional shredded cheddar and fresh parsley.