Spray 3 1/2- to 6-quart slow cooker with cooking spray; Spoon pie filling into cooker; spread evenly.
Beat remaining ingredients except ice cream with electric mixer on low speed 1 minute, scraping bowl constantly; Beat on medium speed 2 minutes, scraping bowl occasionally.
Pour batter over pie filling.
Cover and cook on High heat setting 1 hour 30 minutes to 2 hours or until toothpick inserted in center comes out clean.
Serve with ice cream.
Note from Betty Crocker: This recipe was tested in slow cookers with heating elements in the side and bottom of the cooker, not in cookers that stand only on a heated base. For slow cookers with just a heated base, follow the manufacturer’s directions for layering ingredients and choosing a temperature.