1 pkg. fudge shortbread cookies
1 (11 oz.) can mandarin oranges
1 sm. pkg. vanilla instant pudding
1 c. buttermilk
8 oz. container Cool Whip
1 c. miniature marshmallow (optional)

Crush cookies (save a few for topping). Drain oranges and dice (for topping). Mix pudding with buttermilk; fold in Cool Whip. Add cookies, oranges and marshmallows. Garnish with cookies and oranges; chill.