1. Preheat oven to 350.
2. Mix butter,1/2 cup of sugar& 1/2 tsp vanilla extract with electric mixer on med speed.
3. Mix until light& fluffy,gradually add the flour,mix on low speed until blended.
4. Press on bottom of 13x9 pan 20-23 minutes or until lightly browned.
5. Combine cream cheese,remaining sugar& vanilla extract with electric mixer on med speed.
6. Mix until well blended,add eggs combining well,blend in the chips& pour over crust.
7. Dot top of mixture with caramel topping& with knife,cut through batter for marbled effect.
8. Bake 30 minutes,then cool in pan,chill before cutting into bars.