01 -
Whisk together flour, granulated sugar, brown sugar, cocoa powder, baking soda, baking powder, and salt until smooth and lump-free.
02 -
Beat eggs, buttermilk, vegetable oil, coffee, and vanilla extract until fully blended and smooth.
03 -
Gently fold wet ingredients into dry mix until just combined, avoiding overmixing to maintain tenderness.
04 -
Grease and line three 20 cm round pans with parchment paper; divide batter evenly and tap to remove air bubbles.
05 -
Bake at 175°C for 30–35 minutes until a toothpick inserted comes out with moist crumbs attached.
06 -
Let cakes cool in pans for 10 minutes before transferring to wire racks to cool completely.
07 -
Gently melt chocolate chips, honey, and heavy cream over a double boiler or microwave; stir until smooth and slightly thickened.
08 -
Beat softened butter until light and creamy in a large bowl.
09 -
Gradually add powdered sugar, cocoa powder, salt, then mix in cooled chocolate mixture and vanilla; beat until silky and spreadable.
10 -
Place one cake layer on serving plate, spread frosting generously, repeat layering, then cover top and sides with remaining frosting.
11 -
Decorate with chocolate shavings or sprinkles as desired.