Dark Chocolate Bundt® Cake

Preheat the oven to 350 degrees F (175 degrees C). Spray a fluted tube pan (such as Bundt®) with cooking spray.

Combine butter, coffee, and cocoa in a saucepan over medium heat until butter is melted, about 10 minutes. Stir in vanilla extract and allow to cool, about 10 minutes.

Blend sugar, flour, baking powder, baking soda, and salt together in a bowl. Add cooled chocolate mixture to flour mixture and mix thoroughly.

Mix mayonnaise, buttermilk, and eggs together in another large bowl. Beat with an electric mixer on high speed until well combined, about 2 minutes. Add chocolate mixture and beat on medium-high speed, scraping bowl occasionally, 3 to 4 minutes. Pour batter into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 45 to 50 minutes. Allow to cool for 10 minutes in the pan. Invert cake onto a serving plate and allow to cool completely, about 30 minutes more. Dust top with powdered sugar.