Whisk cold milk with pudding mix until thickened. Let sit 5 minutes.
Fold in whipped topping gently until smooth.
Crush cookies into crumbs.
Spoon pudding into cups, filling about ⅔ full. Top with cookie crumbs.
Add candy decorations like worms, pumpkins, and sprinkles.
Write RIP on Milano or Nutter Butter cookies and insert as tombstones.
Chill at least 30 minutes before serving.
