Please note: To make the 6 layered cake you see pictured; you’ll need to double the cake recipe only. All other measurements are enough to fill, crumb coat and finish decorating the cake.
Preheat a fan-forced oven to 140C / 280F (160C / 320F for no fan). Spray four 20cm / 8-inch cake tins with oil spray and line the bottom with baking paper. Set aside
Combine dry ingredients - Add the flour, sugar, cocoa powder, baking powder, bicarb soda and salt into a large mixing bowl and mix on low speed using a hand mixer to help everything combine.
Add wet ingredients - Next, add the eggs, oil, buttermilk, vanilla and red food dye to the dry ingredients and continue mixing on low speed until everything is well combined. Scrape down the bowl and mix for a final 20 seconds on low speed.
Divide batter - Divide the batter between the four cake tins. I find using an ice cream scoop to help me do this makes it easy to distribute the batter evenly so that everything bakes at the same time.
Bake - Bake for 50-60 min or until a toothpick inserted comes out clean. If the pick comes out with wet batter, bake for a further 10 min at a time until fully baked. Once baked, allow the cakes to cool to room temperature inside the cake tins and then chill them in the fridge overnight. Chilling your cakes overnight makes them easier to trim and decorate. So I bake my cakes the day before I decorate them.
Trim the cakes – To level the top of your cakes, use a cake leveler or large serrated knife to trim the top off.
Adding the first layer - To crumb coat your cake, add a dab of cream cheese frosting onto an 20cm / 8-inch cake board or flat serving plate. Use a small offset spatula to spread the frosting around before adding the first cake layer. Gently press down the center of the cake layer to make sure it’s stuck to the frosting underneath.
To layer the cake - Add frosting to a piping bag and frost a ring around the top of the cake. Fill the center with more frosting. Use your small offset spatula to smoothen out the frosting before you add the next layer of cake. Repeat with the remaining layers.
To crumb coat the cake - Add more frosting around the top and sides of the cake. Use the small spatula to smoothen out the top and sides of the cake, taking care to fill in any gaps in between each layer of cake. Use a cake scraper (otherwise known as a bench scraper) to smoothen out the frosting on the sides and top. Get it as neat as you can. This should just be a neat, thin layer of frosting which is aimed at trapping any cake crumbs so that random bits of cake crumbs don’t show up on the final layer of frosting. Chill for 2 hours or overnight.
Final layer of frosting - Pipe more Swiss meringue buttercream frosting around the side of the cake starting at the bottom, making your way to the top. Add frosting on top. Smoothen out using an offset spatula. To smoothen out, use a cake scraper to go around the cake until it’s smooth. Then use the cake scraper to smoothen out the top.
To finish decorating - Place the skulls on top of the cake. Finish off by piping the blood into the eyes of the skulls and allow it to drip off the sides of the cake.