1Make cookie dough as directed on package. Spread into ungreased 9-inch square pan.
2Beat cream cheese and sugar until smooth; drop about 9 spoonfuls on top of dough in pan. Pull knife through filling and batter in wide curves to swirl. Bake at 350°F 23 to 25 minutes. Cool about 30 minutes.
3Mix chocolate chips and oil in resealable freezer plastic bag; seal. Microwave chocolate on High, 30 to 45 seconds, squeezing chocolate in bag every 15 seconds until smooth. Cut 1/4-inch tip from corner of bag; drizzle chocolate over bars.