Preheat oven to 350°. Grease a 13 x 9-inch baking pan. Evenly spread pie filling over bottom of pan; set aside.
Beat cake mix, Hellmann's® or Best Foods® Real Mayonnaise, water and eggs in large bowl with electric mixer on low speed 30 seconds. Beat on medium speed, scraping sides occasionally, 2 minutes. Pour into prepared pan.
Bake 1 hour or until toothpick inserted in center comes out clean. Cool completely on wire rack. To serve, invert onto serving platter, remove pan and cut into squares.