Grease Kuih Bahulu tin well with Vegetable Oil (to taste).
Preheat oven and Kuih Bahulu tin to 200 degrees C (400 degrees F).
In your mixing bowl, whisk together Egg (4), Granulated Sugar (1 cup) and Salt (1/8 teaspoon) on high speed for about 8 minutes until light and fluffy.
After 8 minutes, turn your mixer to medium speed and drizzle in Vanilla Extract (1/2 teaspoon).
While the butter and sugar cream, in a separate bowl, mix together All-Purpose Flour (2/3 cup) and Baking Powder (1/4 teaspoon).
Lastly, gradually add in flour mixture until everything is well combined.
Transfer the mixture into a large piping bag as it will be easier to pipe into the tins.
Pipe out the mixture into the preheated tins carefully until 90% of the way up. Bake it in the oven for 10 minutes.
Carefully remove the cakes from the tin using a bamboo skewer. Re-grease and repeat until the batter is finished.
Let it cool completely before transferring into an air-tight container. Serve and enjoy!