1 package (4-serving size) instant vanilla pudding mix
1-1/2 cups buttermilk
1 container (8 ounces) frozen whipped topping, thawed
1 can (16 to 20 ounces) pineapple tidbits, drained
1 can (11 ounces) mandarin oranges, drained
1 package (16 ounces) fudge striped cookies, broken into small pieces