Slowly pour in the milk and mix until minimal lumps are left.

Add the cool whip and fold in with a rubber spatula.

In a 9×13 casserole dish, spread 1/2 cup of pudding mixture onto the bottom, similar to how you would lasagna. Layer the crackers as best you can, in one layer. You may need to break pieces of graham crackers to fit the shape and close in the spaces of your casserole dish.