Preheat oven to 350°F. Lightly grease two 8-inch round cake pans with nonstick cooking spray.

Prepare and bake cake according to package directions.

Cool cakes on wire rack 15 minutes. Remove cakes from pans and cool completely.

Arrange one cake on serving plate and evenly spread with 1 cup frosting, leaving sides bare. Add layer of pie filling on top of frosting. Top with second cake layer. Garnish with remaining frosting and pie filling.