I haven’t tested this particular baked apple recipe in a slow cooker. However, it should be possible. You could cook the option with or without the syrup (that cook at the bottom of the dish). I recommend cooking the apples on HIGH for 2-3 hours or LOW for 4-5. Some methods have you add some water to the bottom of the crockpot (around ½ cup) if not using the syrup– but it should work without.