Heat oven to 350°F. Lightly grease 13x9-inch pan.
In large bowl, beat together peanut butter, butter, eggs and water with electric mixer on medium speed until blended. Add cake mix; beat well. Fold in chocolate chips; press into pan.
Bake bars 30 minutes or until golden. Cool completely on wire rack. Cut into squares to serve.
This recipe is recommended for 24 servings