HEAT oven to 350ºF.
BEAT cake mix, butter and 2 eggs with mixer until blended; spread onto bottom of 13x9-inch pan sprayed with cooking spray.
PLACE cream cheese, peanut butter and remaining eggs in separate large bowl; beat with mixer until blended. Gradually beat in sugar; pour over batter in pan.
BAKE 30 min. or until edges are firm. Cool slightly.