Preheat the oven to 350°F (175°C). Grease a 9x13 inch baking dish.

In a large mixing bowl, combine shredded chicken, sour cream, mayonnaise, cream of chicken soup, cheddar cheese, mozzarella cheese, Parmesan cheese, garlic powder, onion powder, dried oregano, salt, and pepper. Mix until well combined.

Transfer the chicken mixture to the prepared baking dish, spreading it evenly.

In a separate bowl, mix crushed crackers with melted butter. Sprinkle this cracker mixture over the chicken layer.

Bake in the preheated oven for 40 minutes or until the casserole is bubbly and the top is golden brown.

Remove from the oven, let it rest for a few minutes, and garnish with fresh parsley before serving.