Herewith the recipe which I have modified for more accurate measurements. I have also tried to explain the method a bit more for greater clarity. The original recipe is in Malay language and translated into English:
2. In a separate bowl, beat butter & condensed milk until white & fluffy.
3. Grease & line 8 inch square tin.
4. For all layered cakes, I always bake the cake at 180C for 30 minutes as the last step to ensure that the cake is properly cooked through.
For those interested in making layered cake are welcome to ask questions. Just post your questions in the "comments" tab at the bottom of this recipe.