Spray inside of your slow cooker with cooking spray, and pour the pie filling into cooker.
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Beat remaining ingredients with spoon until smooth. Spread batter over pie filling. Cover and cook on high for 1.5 to 2 hours or until toothpick inserted in center comes out clean. Serve with vanilla ice cream.
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Note: Other pie fillings, such as apple or blueberry, work just as well with this recipe.