Set sous vide machine to 79.5C/175F.
Add sliced apples, brown sugar, cinnamon, nutmeg and butter in sous vide bag. Seal and shake bag until ingredients are well combined. Remove air through a vacuum sealer or the displacement method, and drop the bag in the bath for one hour.
Remove bag from bath, pour apples and sauce on to a serving plate. Serve with some ice cream or just enjoy the delicious cinnamon apples on their own!