Preheat your oven to 325°F and generously grease a bundt pan.

Whisk together the all-purpose flour, unsweetened cocoa powder, baking powder, and salt in a large bowl.

Cream the unsalted butter and granulated sugar in a separate mixing bowl until light and fluffy.

Add the large eggs one at a time to the creamed mixture, mixing well after each addition.

Alternate adding the dry ingredients with the buttermilk, starting and ending with the dry mixture.

Stir in the vanilla extract gently, then pour the batter into your prepared bundt pan.

Bake for 70-80 minutes, or until a toothpick comes out clean.