Melt the butter in an oven-safe pan over medium heat. Add the onion and celery and cook until softened.
Add the flour and minced garlic and cook for about 2 minutes.
Slowly pour in the chicken broth, stirring until combined. Season to taste with garlic powder, onion powder, celery salt, poultry seasoning, seasoned salt, and black pepper.
Add the chopped rotisserie chicken and Better Than Bouillon. Stir in the heavy cream, sour cream, and green beans until everything is combined.
In a bowl, combine the melted butter, warm water, and Stove Top stuffing. Stir and let sit for 2 minutes.
Pour the stuffing evenly over the top of the chicken mixture.
Bake uncovered at 350°F for 30 minutes.
Serve by itself or over mashed potatoes.