1 (12 oz.) Cool Whip
1 pkg. instant vanilla pudding
2 c. buttermilk
2 c. mandarin oranges, drained
Marshmallows, if you want
Chopped nuts, if you want
1/2 pkg. fudge stripe cookies

Mix together Cool Whip, pudding, and buttermilk. Add oranges, marshmallows and nuts, if desired. Add cookies just before serving.