Make the cake batter

• In a large mixing bowl, mix the cake mix, eggs, water and oil until well combined.
• Transfer the batter to a greased square baking pan.

Bake the cake

• Bake at 180 °C, covering with foil halfway through.
• Bake until a skewer comes out clean.

Cool and cut out the mini cake

• Allow the cake to cool completely.
• Press a greased ramekin into the center and twist to remove.
• Let the mini cake slide out of the ramekin.

Create two layers

• Slice through the center of the mini cake to create 2 layers.
• Place the bottom layer back in the ramekin.

Frost and decorate

• Top the bottom layer with a layer of frosting.
• Add the top layer of cake and spread another layer of frosting evenly to the edges.
• Cover in rainbow nonpareils.

Chill and serve

• Allow to chill and slightly harden in the fridge.
• Take a center bite and enjoy.