Preheat the oven to degrees 400 F. In a large bowl, combine chopped precooked chicken, mixed vegetables, cream of mushroom soup and ¼ cup of milk. Stir in garlic powder, onion powder and parsley.
Pour mixture in a 9 in pie plate that has been lightly sprayed with non stick spray. Set aside for now. In a separate bowl, whisk together Bisquick, egg and remaining ½ cup of milk. Carefully pour the batter on top of the chicken/vegetable mixture.
Place the pie pan on a baking sheet (just in case some bubbles over). Bake for approximately 25 minutes, or until the crust is golden brown. Remove and let cool slightly before serving.