Preheat your oven to 350°F (175°C). Prepare two 9-inch round cake pans by greasing them with butter or non-stick spray, then dusting with flour, or by lining the bottoms with parchment paper for easier removal.
In a large mixing bowl, use an electric mixer on medium speed to cream the softened butter and granulated sugar together. Mix until the mixture becomes light and fluffy, about 3-4 minutes.
Incorporate the eggs into the butter-sugar mixture one at a time, ensuring each egg is fully mixed in before adding the next. Follow this by adding the vanilla extract and mixing until thoroughly combined.
In a separate bowl, sift together the all-purpose flour, unsweetened cocoa powder, baking powder, baking soda, and salt. This step will help create a lighter cake by aerating the dry ingredients.
Gradually add the dry ingredient mixture to the wet ingredients in three parts, alternating with the buttermilk. Start and end with the dry ingredients. Mix gently until just combined, avoiding overmixing to keep the cake tender.
Carefully fold in the dark chocolate chips, milk chocolate chips, and white chocolate chips until evenly distributed throughout the batter.
Slowly stir in the hot brewed coffee, mixing until the batter is smooth and well combined. Note that the batter will be relatively thin, which is normal.
Evenly distribute the cake batter between the prepared pans. Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center of the cakes comes out clean or with a few moist crumbs.
Once baked, allow the cakes to cool in the pans for about 10 minutes. Carefully remove them from the pans and transfer to a wire rack to cool completely.
For an indulgent finish, frost the cooled cakes with your favorite chocolate frosting. You can enhance the presentation by topping the frosting with additional chocolate chips or drizzling with melted chocolate for a delectable touch.
Notes
For an indulgent finish, frost with chocolate frosting and top with additional chocolate chips.