Ultra moist and decadent, this chocolate mayonnaise cake is a cinch to whip up, thanks to a doctored-up cake mix. Perfect for special occasions, holidays, or anytime you need to satisfy a chocolate craving!
Preheat oven to 325F and grease a bundt pan well with nonstick spray or butter. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment (or in a large mixing bowl with a handheld electric mixer), combine cake mix, pudding mix, mayonnaise, eggs, and water. Mix on low speed for about 30 seconds, then scrape down the sides of the bowl. Increase the speed to medium-high and beat for another 2 minutes.
Pour the batter into the prepared pan, spreading evenly. Bake in preheated oven for 40-45 minutes, or until a toothpick inserted in the center of the cake comes out clean.
Allow the cake to cool in the pan for about 10 minutes, then run a knife along the edge of the pan to ensure the cake is separated from the pan. Invert the cake onto a serving plate, then allow to cool completely.
Once the cake is cooled, prepare the icing. Combine chocolate chips, butter, and milk in a microwave-safe bowl. Microwave for 30 seconds, then stir well. Continue microwaving in 15-second increments, stirring after each, until the chocolate chips are fully melted and the mixture is smooth.
Add sifted powdered sugar to the chocolate mixture, stirring or whisking well until incorporated and no lumps remain.
Let the icing cool for a few minutes, then drizzle it over the top of the cake. Let the cake sit for a few minutes to allow the icing to harden to a satiny finish.
Notes
If you can't find a Devil's Food cake mix, a regular chocolate cake mix will work fine as well.
Use regular mayonnaise in this recipe, such as Duke's, Hellman's, or store brand. I do not recommend using "light" mayonnaise, olive oil mayo, or Miracle Whip salad dressing.
Using sifted powdered sugar helps to prevent lumps in the icing.
The icing is technically optional, but it sure is tasty! If you decide to skip it, you could just dust the top of the cake with powdered sugar.