Dark Chocolate Bundt Cake

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Spray a fluted tube pan (such as Bundt) with cooking spray.

Step 2
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.

Step 3
Blend sugar, flour, baking powder, baking soda, and salt together in a bowl. Add cooled chocolate mixture to flour mixture and mix thoroughly.

Step 4
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.

Step 5
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.