Ho Ho Bumpy Cake

1 . Stage

Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 15x10-inch jelly roll pan.

2 . Stage

Combine cake mix, water, eggs, and oil in a large bowl; beat with an electric mixer on low speed until moistened. Increase speed to medium and beat for 2 minutes. Pour batter into the prepared pan.

3 . Stage

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 24 to 29 minutes. Let cool completely, at least 45 minutes.

4 . Stage

Combine sugar, shortening, evaporated milk, butter, vanilla extract, and salt in a bowl. Beat with a hand mixer until light and fluffy, 10 to 15 minutes. Pipe cream frosting in lines over the cooled cake.

5 . Stage

Place chocolate frosting in a microwave-safe bowl. Warm in the microwave for 1 minute, checking after 30 seconds. Drizzle melted frosting over the cream with a spoon. Refrigerate until set, about 1 hour.