Preheat oven to 350. Shake flour in bag; place in 13 X 9 X 2" pan. Add gravy mix, garlic powder & water. Squeeze bag to blend ingredients. Place vegetables in bag in even layer. Sprinkle chicken with seasonings; place on top of vegetables. Arrange biscuits around chicken. Close bag with tie; cut 6 half inch slits in top. Bake until tender, 50-55 minutes.