Preheat the oven to 350°F (175°C).

In a mixing bowl, combine the cream cheese, sour cream, ranch dressing, and half of the cheddar cheese. Mix until smooth.

Add the chicken pieces to the mixture and stir until well coated.

Transfer the chicken mixture to a greased baking dish and spread it evenly.

In another bowl, combine the crushed Ritz crackers, melted butter, garlic powder, and the remaining cheddar cheese. Mix until combined.

Sprinkle the cracker mixture evenly over the chicken mixture in the baking dish.

Bake in the preheated oven for 30-35 minutes, or until the top is golden brown and the chicken is cooked through.

Remove from the oven and let it cool for a few minutes before serving.