Preheat oven to 425 degrees F (220 degrees C). Spray a casserole dish with cooking spray.
Combine chicken soup, milk, thawed vegetables, turkey, crescent roll dough, salt, and pepper in a bowl. Transfer mixture to the prepared casserole dish. Top with bread crumbs. Spray a layer of cooking spray on top.
Bake in the preheated oven until casserole is heated through, about 30 minutes. Let cool slightly before serving, 5 to 10 minutes.