Pre heat oven to 350°. In a small, non-stick skillet, brown pork chops in oil. Place in an 8 inch square baking dish, coated with non-stick cooking spray. Layer with sweet potato. Drizzle with butter.
In small saucepan, combine orange juice, brown sugar, salt, ginger, cinnamon, and pepper. Bring to a boil, stirring constantly. Pour over sweet potato.
Cover and bake at 350° for 30-35 minutes or until pork reached 160° and potato is tender. Remove pork and potato, and keep warm.
Pour pan juices into a small saucepan. Combine cornstarch and water until smooth. Then, stir into juices. Bring to a boil. Cook and stir for 1 minute or until thickened. Serve over pork and sweet potato.