Whisk the instant vanilla pudding mix and cold milk in a large mixing bowl for approximately 2 minutes until the mixture thickens.

Stir in the green food coloring until the pudding reaches a uniform festive green hue.

Crush the chocolate sandwich cookies into coarse crumbs using a food processor or a sealed plastic bag and rolling pin.

Layer the bottom of 6 clear individual serving cups with half of the crushed cookies.

Divide the green pudding evenly among the cups, pouring it over the cookie base.

Top the pudding layer with the remaining chocolate cookie crumbs to resemble soil.

Pipe or spoon a generous dollop of whipped topping onto each cup.

Garnish with gold decorative sugar sprinkles to represent gold at the end of a rainbow.

Refrigerate for a minimum of 30 minutes to allow the pudding to fully set before serving.