Preheat your oven to 350°F (175°C) and grease a 9x13 inch casserole dish with non-stick cooking spray.

In a large mixing bowl, combine the chocolate cake mix, three large eggs, one cup of water, and one-third cup of vegetable oil. Blend until smooth.

Pour the cake batter into the greased casserole dish and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean. Let it cool on a wire rack.

Beat the softened cream cheese until creamy, then add powdered sugar and fold in whipped topping until light and fluffy.

Spread the creamy filling evenly over the cooled cake, press crushed Oreos on top, and arrange gummy worms creatively.

Cover with plastic wrap and refrigerate for at least one hour before serving.