Preheat oven to 350 degrees F and grease a 9x13 inch baking dish with cooking spray. Set aside.
Melt butter over medium heat in a large non-stick pan.
Once melted, add in potatoes, onion, celery, carrots, garlic powder, salt, and pepper.
Cook, stirring regularly, for 10-15 minutes, or until the potatoes and carrots are tender.
Sprinkle in flour and cook for 1 minute, stirring constantly.
Slowly whisk in chicken broth, then half and half.
Stir in cubed chicken and green beans, bring to a simmer, then simmer for 3-5 minutes or until thickened into a gravy consistency.
Stir in the shredded cheese, pour into prepared baking dish, then top with the biscuits in a single layer.
Bake in preheated oven for 25 minutes or until the biscuits have cooked through.
Remove from oven and allow to sit for 10 minutes to thicken before scooping, serving, and enjoying!
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