In a large bowl, mix together the dry pudding mixes and buttermilk.
Then fold and in Cool Whip and stir until combined.
Add in the pineapple and mandarin oranges until incorporated.
Break cookies into bite-size pieces and gently fold into salad mixture.
Serve immediately.
If preparing ahead of time, add cookies right before serving.
Notes
This recipe calls for buttermilk. It definitely tastes best with buttermilk, but you could also make it with milk, if you desire. I personally prefer the buttermilk, because it's a little thicker.
When you fold in the cool whip, we really mean fold. If you mix it with an electric mixer, your whipped cream will become more liquidy, and not so thick and fluffy.
If you don't want to add the cookies, you most definitely don't have to. You could easily go without them.
If you make this recipe ahead of time, we recommend adding the cookies right before serving. If you make it ahead of time with the cookies, they will become mushy and won't taste as good.