01 -
Whisk together flour, granulated sugar, brown sugar, cocoa powder, baking soda, baking powder, and salt in a large bowl until evenly mixed and free of lumps.
02 -
In a separate bowl, beat eggs, then add buttermilk, vegetable oil, coffee, and vanilla extract. Stir until smooth and homogeneous.
03 -
Pour wet mixture into dry ingredients and gently fold together until no dry streaks remain. Avoid overmixing to maintain tender crumb.
04 -
Grease three 8-inch round cake pans and line bottoms with parchment paper. Divide batter evenly among pans, tapping gently to release air bubbles.
05 -
Bake in preheated oven at 350°F (175°C) for 30 to 35 minutes, or until a toothpick inserted into center comes out with a few moist crumbs.
06 -
Allow cakes to cool in pans for 10 minutes before transferring to wire racks to cool completely.
07 -
Melt chocolate chips with honey and heavy cream using a microwave or double boiler. Stir until smooth and let cool slightly to thicken.
08 -
Beat softened butter in a large bowl until creamy and fluffy.
09 -
Add powdered sugar, cocoa powder, and salt to the butter. Beat until combined, then incorporate the cooled chocolate mixture and vanilla extract until smooth.
10 -
Place one cake layer on serving plate and spread frosting evenly on top. Repeat stacking and frosting remaining layers.
11 -
Cover sides and top fully with remaining frosting. Optionally garnish with chocolate shavings or sprinkles.