Preheat oven to 350°F (175°C). Grease and flour a 10-inch bundt pan.
In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt.
Add buttermilk, oil, eggs, and vanilla extract to the dry ingredients and mix until combined. Gradually add the boiling water and mix until the batter is smooth.
Pour batter into the prepared bundt pan.
Bake for 45-55 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.
To make the glaze, whisk together powdered sugar, cocoa powder, milk, and vanilla extract until smooth. Drizzle over the cooled cake.
Notes
Enjoy this delicious chocolate bundt cake! Feel free to add chocolate chips to the batter for extra chocolatey goodness.