HEAT oven to 375°F. Coat 13 x 9-inch baking dish with no-stick cooking spray.
HEAT oil in medium saucepan over medium heat. Stir in flour until mixture is smooth. Gradually add chicken broth, stirring until combined. Stir in milk, poultry seasoning, salt and pepper. Bring to a boil over high heat, stirring occasionally.
STIR in frozen vegetables. Cover and cook over low heat 5 minutes, stirring often. Stir in cooked chicken. Pour into prepared dish. Arrange frozen biscuits on top of chicken mixture.
BAKE 30 minutes or until tops of biscuits are golden brown.