2 (20 ounce) cans apple pie filling

1 (15.25 ounce) package yellow cake mix

½ cup unsalted butter, cut into cubes

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¼ teaspoon ground cinnamon, or to taste

Pour both cans of apple pie filling into a slow cooker. Sprinkle cake mix evenly over top to cover filling. Dot butter cubes over cake mix and sprinkle cinnamon over top.

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Cover and cook on High until filling is bubbly and topping is golden brown, about 2 hours.