Preheat your oven to 350°F (175°C) and bake the chocolate cake according to the package instructions in a 9x13 inch baking dish for 30-35 minutes. Allow to cool completely and cut into bite-sized cubes.

In a large mixing bowl, whisk together the white chocolate pudding mix and 2 cups of cold 2% milk for about 2 minutes until thickened. Fold in the thawed Cool Whip until well combined and add green food coloring to achieve the desired hue.

In a clear trifle dish, start layering with 1/4 of the mousse mixture, followed by one-third of the chocolate cake cubes, a third of crushed Oreos, and sprinkle gummy worms on top.

Repeat the layers of mousse, cake, Oreos, and gummy worms until all ingredients are used, finishing with the mousse layer at the top for a striking presentation.

Top with remaining crushed Oreos and arrange gummy worms. Cover with plastic wrap and chill in the refrigerator for at least 2 hours.

Serve by scooping out portions to showcase the layered dessert, enjoyed chilled.