add powdered /icing sugar slowly and whisk until smooth.
refrigerate it.
allow it to set in refrigerator for 3 hours atleast.
cake preparation,
First, sift the all-purpose flour/maida with the baking powder and a pinch of salt in a mixing bowl or pan. just keep everything ready as you have to be quick enough to mix the batter.
Grease your cake mould with butter or oil. you can also line the mould with butter paper and then grease the butter paper with oil or butter.
Now take butter and Whisk it in another mixing bowl.
add condensed milk.
add powdered sugar.
now, slowly add drinking soda and whisk for 2 min.
after 5 min you will get nice smooth butter texture.There is no need to heat it.
add dry flour mix and whisk.
add drinking soda and prepare a nice fluffy batter.
Pour the batter into the greased baking mold. shake and tap the sides of the pan so that air bubbles are released.
preheat the oven to 180°c for 10 minutes.
bake the cake at 180 degree Celsius or 356 degrees fahrenheit for 35 to 40 minutes. to bake in microwave or cooker check out the notes section below.
to check the cake has baked completely, always insert a toothpick at the centre and see if it comes out clean. else bake for 5 more minutes.
Notes
you can use thick curd instead of greek yogurt if it is not available.