Cookie Salad

1 cup buttermilk
1 (8 ounce) container Cool Whip
1 small box instant vanilla pudding
1 small can Mandarin oranges, drained
1 large can pineapple tidbits, drained
1 package fudge stripe cookies, broken up

Mix buttermilk and vanilla pudding together. Fold in Cool Whip. Add oranges and pineapple. Mix in cookies. Refrigerate until ready to serve.