I preheat the oven to 350°F (175°C) and spray a small rimmed baking sheet (or 9x13-inch pan) with cooking spray to prevent sticking for this spooky dessert.

In a large bowl, I mix 1 box chocolate cake mix, 1 cup water, ½ cup vegetable oil, and 3 eggs until smooth. I spread the batter evenly on the baking sheet and bake for 12–15 minutes, until a toothpick comes out clean. I let the cake cool completely for a perfect festive trifle base.

In a medium bowl, I whisk 2 boxes vanilla pudding mix with 4 cups milk until smooth, adding a few drops of orange food coloring for a Halloween vibe, if desired. I chill the pudding in the fridge for 10–15 minutes to set for this chocolate layered treat.

Once cooled, I cut a circle from the cake using the trifle dish rim as a guide, trimming as needed. I layer the cake at the bottom of a clear trifle dish, pipe or spoon the pudding over it, and top with 8 oz Cool Whip for a creamy spooky dessert.

I sprinkle ¼ cup Halloween-themed sprinkles, ½ cup chocolate eyeball candies, and ½ cup gummy body parts on top, adding edible glitter or cookies for extra flair. I serve immediately or chill for up to 1 day for a stunning festive trifle.