Preheat the slow cooker to low heat.
Roll out the pie crust and place it in the bottom of the slow cooker, pressing it into the edges.
In a large bowl, combine the apples, brown sugar, flour, cinnamon, and nutmeg. Toss to combine.
Add the apple mixture to the slow cooker, spreading it evenly over the pie crust.
Drizzle the melted butter over the top of the apple mixture.
Cover and cook on low heat for 3 hours.
Uncover and drizzle the caramel sauce over the top of the pie.
Cover and cook for an additional 1 hour.
Serve warm with a scoop of ice cream, if desired.