First, preheat the oven to 350 degrees.
Second, place the entire stick of butter in the baking dish (casserole dish) and place into the oven while it's preheating in order to melt the butter.
Third, mix the milk, Cheddar Bay Biscuit baking mix, salt, pepper, and the garlic seasoning packet in a large bowl.
Next, take the cooked, shredded chicken and layer it on top of the melted butter in the baking dish.
Then, layer the mixed vegetables right on top of the chicken layer.
The next layer will be 1/2 of the milk and biscuit mixture. Pour this on top of the mixed vegetables.
Sprinkle 1 cup of shredded cheddar cheese on top of the milk and biscuit layer.
In a separate mixing bowl add 1 can of cream of chicken soup, 2 cups of chicken broth, and the poultry seasoning and mix well.
Pour this chicken soup mixture on top of the shredded cheese layer.
Lastly, pour the other half of the milk and biscuit mixture on top.
Bake the chicken pot pie for 45 minutes or until the tops of the biscuits are golden brown. When you pull it out of the oven it is going to have a little "jiggle" to it. Don't be alarmed. It is finished cooking. You just need to let it sit for 8-10 minutes before you serve.
Enjoy with your favorite sides! (Look below for some good ideas)