Cut a layer off the top of the apples with a knife.
With a melon baller or measuring spoon, remove the core and seeds from each apple.
Pack 1/8 cup granola into each apple, and place into the slow cooker.
Drizzle the apples with melted butter and add a teaspoon of Calef's Apple Butter to each apple.
Cover and cook on high for 2 to 2 1/2 hours until tender, but not falling apart.
Serve as is, or add ice cream or whipped cream.