1. Heat oven to 350°F (325°F for dark or nonstick pan). Grease and flour a 15x10x1-inch or 13x9-inch pan, or spray with baking spray with flour.
2. In a large bowl, gently mix dry cake mix, pie filling, eggs and chocolate chips with a rubber spatula and break up any undissolved cake mix by pressing with the spatula. Carefully spread in the pan.
3. Bake 15x10x1-inch pan for 23 to 27 minutes or 13x9-inch pan for 29 to 34 minutes, or until a toothpick inserted in the center comes out clean. Cool completely for about 1 hour, and then cover with frosting. Store loosely covered.
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