Preheat the Oven: Set your oven to 375°F (190°C) and grease a 9x13-inch casserole dish with non-stick spray or olive oil.
Mix the Creamy Base: In a large mixing bowl, combine sour cream, cream of chicken soup, melted butter, and ranch seasoning. Stir until the mixture is smooth and creamy.
Layer the Casserole: Spread the shredded chicken evenly across the bottom of the prepared casserole dish. Pour the creamy mixture over the chicken and spread it evenly. Add the shredded hash browns (or cauliflower rice for a low-carb option) as the next layer.
Top with Cheese and Bacon: Sprinkle 2 cups of shredded cheddar cheese over the top of the casserole. Add the cooked and crumbled bacon evenly across the cheese layer.
Bake: Place the casserole in the oven and bake uncovered for 25–30 minutes, or until the cheese is melted and bubbly.
Serve: Let the casserole cool for 5 minutes before serving. Garnish with fresh parsley for added color if desired.