Preheat the oven to 350°F and lightly grease an 8-inch square baking dish.
In the dish, toss the chopped apples with sugar and cornstarch until coated.
In a medium bowl, combine oats, crushed cookies, cinnamon, salt, melted butter, and milk. Stir until the mixture is crumbly and evenly moistened.
Sprinkle the topping evenly over the apples.
Bake for 25–30 minutes, or until the fruit is bubbling and the topping turns light golden.
Press whole Circus Animal cookies gently onto the warm crisp right after removing it from the oven. They’ll stay crunchy and add that signature frosted finish.
Serve warm with scoops of vanilla or birthday cake ice cream.