1Heat oven to 325°F. In large bowl, beat dry cake mix and butter with electric mixer on low speed until crumbly; reserve 1 cup. In bottom of ungreased 13x9-inch pan, press remaining crumbly mixture.
2In same bowl, beat cream cheese and frosting with electric mixer on medium speed until smooth. Beat in eggs until blended. Pour over crust; sprinkle with reserved crumbly mixture.
3Bake about 45 minutes (about 42 minutes for dark or nonstick pan) or until set; cool completely. Cover and refrigerate at least 2 hours until chilled. For bars, cut into 6 rows by 6 rows. Store covered in refrigerator.