Slice cookie dough; place in single layer on bottom of 13x9-inch pan. Press to completely cover bottom of pan.
Bake 15 to 18 min. or until lightly browned.
Microwave caramels and water in microwaveable bowl on HIGH 2 to 3 min. or until caramels are completely melted, stirring after each minute; pour over crust. Top with remaining ingredients.
Bake 5 to 7 min. or until marshmallows are lightly browned. Cool completely before cutting into bars.
