In a medium bowl combine all ingredients except apples

Using a pastry cutter (or with your handwork the butter into the dry ingredients until mixture is crumbly - set aside

Wash apples & cut off the tops

Spoon out some of the core & inner flesh to make a "bowl"

Fill each hallow apple with your crumble mixture & place inside your crock pot

Cover & cook 2-2.5 hours - just enough that the apples soften but are not falling apart

Serve with a scoop of ice cream or whipped cream on top (I like to add some caramel too)