Spread the blueberry pie filling in the bottom of a greased crockpot insert.
Top with the cake mix and sprinkle with ground cinnamon. Drizzle with melted butter.
Cover and cook on low for 3-4 hours. For a crisper topping, during the last 30 minutes, drape paper towels over the crockpot insert, and replace the cover to absorb the moisture that drips from the cover.
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Notes
One: Oven VersionPreheat the oven to 350˚F. Spread the blueberry pie filling out in a greased 9x13-inch pan. Top with the cake mix and ground cinnamon, and drizzle with melted butter. Bake at 350˚F for 50-55 minutes.Two: StorageAllow the leftovers to cool. Store them in an airtight container in the fridge for up to 4 days or in the freezer for up to 3 months.