Step 1

Mix the eggs, sugar, Ovalette, and vanilla essence in a bowl.

Step 2

Add sifted all-purpose flour, cocoa powder, and baking powder into the batter and fold the mixture to combine. Then, add 2 tablespoons of oil and milk while mixing.

Step 3

Pour the batter into 3 different greased 4-inch baking tins and bake in preheated oven for 25 minutes at 180 degrees Celcius. Allow the baked dessert to cool before slicing it into 2 or 3 layers.

Step 4

For the buttercream, add unsalted butter into a bowl and beat for 2 minutes. Then, add vegetable shortening. Beat for another 3 minutes until it smoothens.

Step 5

Gradually add sifted powdered sugar and fold the mixture until it thickens. Then, add evaporated milk and vanilla essence before mixing again until the buttercream becomes smooth and creamy.

Step 6

Assemble the lunchbox cake. Spread buttercream on each layer and apply the first coat of frosting. After 15 minutes, add the final frosting, decorate and serve.