First lay parchment paper in a 4'X4' cake tin. Brush it slightly with oil and set aside.
Place a sieve in a bowl. Add 1 cup flour(maida), ¼ cup vanilla flavored custard powder, 1 teaspoon baking powder and 1 teaspoon baking soda.
Sieve it well.
Mix it well with a whisk. Set aside.
Preheat oven at 180 DEG C for 10 minutes. To a mixing bowl add ¼ cup oil, ¼ cup thick curd and ½ cup granulated white sugar.
Whisk it well until creamy and sugar dissolves.
Now we need ½ cup milk in total - Add half of it first.
Whisk it well.
Add in flour mix.
Mix it slightly.
Add remaining milk to it.
Mix gently to form a smooth lump free batter.
Transfer batter to the prepared cake tin.
Tap few times to remove air bubbles.
Bake in preheated oven at 180 DEG C for 40 minutes.
Cool down in tin itself for 15 minutes then scrape sides using a knife and invert to demold. Remove the parchment paper.
Cool down the cake for a