In a mixing bowl, whisk together the instant chocolate pudding mix with cold milk for about 2 minutes until the mixture thickens and becomes smooth.
Divide the pudding evenly among small cups or jars, filling each about three-quarters full to create a base layer.
Sprinkle crushed cookies over the pudding to mimic dirt, covering the surface evenly with a crumbly texture.
Place pre-made graham cracker tombstones into each cup, pressing them slightly into the crumb layer for stability.
Add green gummies or jelly creepers around the tombstones and along the edges to resemble creeping vines and foliage.
Optionally, add candy gravestones or Halloween-themed decorations on top to enhance the spooky scene.
Allow the assembled pudding cups to set in the refrigerator for at least 1 hour before serving, so the layers firm up and the decorations stay in place.
Once chilled, serve the Halloween Graveyard Pudding Cups with a spooky straw or spoon for a delightfully eerie treat.