Add the melted butter to your baking dish, layer the shredded chicken and the frozen veggies. Sprinkle the onion powder, garlic powder and salt and pepper to taste.
In a bowl whisk together the Red Lobster cheddar biscuit mix (including the seasoning packet) and the milk.
Pour the biscuit mix on top of the chicken and frozen veggies. Do not stir or mix.
In a bowl mix the cream of chicken soup with the chicken stock until well combined.
Pour the mix on top of the chicken, veggies and biscuit mix. Do not stir.
Bake uncovered for 45 minutes until the biscuit has risen to the top and it is golden brown.