Spread the apple pie filling in the bottom of a greased or lined slow cooker.
Combine the cake mix, ground cinnamon, ground nutmeg, and ground allspice. Dump the mixture over the apple pie filling and spread it evenly to cover the filling.
Drizzle the melted butter over the cake mix so that it covers most of the surface. You can also tilt the crockpot to help the butter flow over the cake mix.
Cover and cook on low for 3-4 hours. For a crisper topping, drape paper towels over the crockpot insert during the last 30 minutes, then replace the cover. The paper towels will absorb the moisture that drips from the cover.
Drizzle with caramel syrup and serve with vanilla ice cream.
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Notes
Allow leftovers to cool. Store in an airtight container in the fridge for up to 4 days or in the freezer for up to 2 months.