Core apples; cut a strip of peel from the top of each apple. Place apples, top sides up, in a 3-1/2- or 4-quart slow cooker.
In a small bowl combine figs, brown sugar, and apple pie spice. Spoon mixture into centers of apples, patting in with a knife or narrow metal spatula. Pour apple juice around apples in cooker. Top each apple with a piece of butter.
Cover and cook on low-heat setting for 5 hours or on high-heat setting for 2-1/2 hours.
Using a large spoon, transfer apples to dessert dishes. Spoon some of the cooking liquid over apples. Serve warm.