Preheat oven to 180C or 350F. Grease and line a 20cm round cake tins.
Sift flour, cocoa powder, baking powder, bicarb soda and salt into a bowl. Set aside.
Beat butter and sugar together for 2 minutes or until light and fluffy. Add eggs, one at a time, beating until combined. Add vanilla extract. Beat on high for 2 minutes.
With the mixer on low speed, beat in flour mixture (2-3 additions) alternating with buttermilk. Divide batter among cake tins. Beat for 25-30 minutes or until a skewer inserted into the cake comes out clean. Remove from oven. Transfer to wire rack to cool completely.
Chocolate buttercream frosting:
Recipe link just below this recipe
Frost cake with buttercream icing. Refrigerate cake for 15-20 minutes.
Chocolate drip:
Place chocolate chips in a heatproof bowl. Set aside.
Place heavy cream in a saucepan over low heat. Add hot cream to chocolate. Stir until smooth. Pour ganache into a plastic bottle. Drizzle on the cake to create “drip” look.