Chop the granny smith apples into chunks, and set aside.
3 granny smith apples
In a medium mixing bowl, whisk together pudding mix and milk, until smooth.
3.4 ounces instant vanilla pudding, 3/4 cup milk
Add the cool whip, and whisk until well combined.
8 ounces whipped topping
Add the caramel sauce, and stir to combine.
2 Tablespoons caramel sauce
Fold in the apple chunks and mini marshmallows.
1 cup miniature marshmallows
Before serving, drizzle with caramel sauce.