1Spray 2- to 3 1/2-quart slow cooker with cooking spray.
2In large bowl, toss apples, granulated sugar, brown sugar and cinnamon. Add to slow cooker.
3In medium bowl, mix melted butter and dry cake mix. Sprinkle on top of apples.
4Cover; cook on High heat setting 2 to 3 hours or until apples are soft, removing cover for last 30 minutes of cooking.