In a large skillet coated with cooking spray, cook turkey until no longer pink; drain. Meanwhile, in a large saucepan, combine flour and milk until smooth. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the vegetables, salt, pepper and turkey; remove from the heat and keep warm.
Place biscuits 2 in. apart on an ungreased baking sheet. Bake at 400° for 5 minutes.
Transfer turkey mixture to a greased 8-in. square baking dish. Place nine biscuits over turkey mixture. Bake potpie and remaining biscuit for 5-7 minutes or until biscuits are golden brown.