01 -
Preheat the oven to 175°C. Grease four 23-centimetre cake pans with cooking spray. In separate large bowls, prepare each cake mix according to the package instructions using the specified ingredients.
02 -
Evenly divide the prepared chocolate and vanilla batters among the four pans, creating two layers of each flavour. Bake for approximately 30 minutes or until a toothpick inserted in the centre exits clean. Let the cakes cool on a wire rack until completely cool.
03 -
In a large bowl, beat softened butter and half of the powdered sugar until smooth. Mix in the milk, vanilla extract, and pumpkin spice. Gradually incorporate the remaining powdered sugar and beat until light and fluffy. Blend in orange food colouring until a vivid shade is achieved.
04 -
Gently heat the heavy cream in a small saucepan over low heat until bubbles form at the edges. Place chocolate chips in a heatproof bowl, pour over hot cream, and let stand for 2 minutes. Whisk until completely smooth and glossy.
05 -
Trim the tops of cake layers for even assembly. Secure the first vanilla layer onto a serving plate with a dab of frosting.
06 -
Spread 1 cup of frosting over the first layer. Place a chocolate layer on top and cover with another cup of frosting. Repeat with remaining vanilla and chocolate layers, finishing with the chocolate layer on top. Apply remaining frosting around the sides and over the top for a smooth finish.
07 -
Drip the ganache along the edge of the cake for a dramatic effect, then pour the remaining ganache over the top and spread with an offset spatula.
08 -
Arrange ghost peeps on skewers as figures emerging from the cake, place halved Milano cookies as gravestones, scatter crushed Oreos for soil, and garnish with sprinkles, candy corn, candy pumpkins, and candy eyeballs to create a festive graveyard scene.