Procedure for the base

1. Mix the water and egg in the mixer using the balloon whisk attachment for 1 minute at medium speed.
2. Add the prepared Vanilla Sponge Cake mix and continue mixing until it is fully incorporated into the liquids.
3. Using a spatula, scrape the mixture from the sides of the saucepan, then beat on high speed for 10 minutes.
4. Pour the mixture into 3 greased pans and bake at 160 °C for about 40 minutes. Let cool.

To assemble the cake and the frosting

1. Cut the cake slices in half horizontally (this will give us 6 pieces in total).
2. Moisten just 3 cake layers with the tres leches syrup, and use a little whipped cream and white chocolate chunks as filling to assemble the cake.
3. Once the cake is assembled, lightly cover the sides with whipped cream. Use a spatula to form a spiral on top, and finish by decorating with colorful sprinkles.
4. If you'd like, repeat steps 1 through 4 to fill and decorate the remaining 3 cake layers.