Hokkaido chiffon cake

I've been a laggard in baking these yummy Hokkaido chiffon cakes. There are so many recipes out there, and I took the easy way out when I found one in DreamersLoft who has made comparison of 2 recipes. Taking the same cue, I also tried out Reirei's recipe and they are really good - soft & yummy - even when chilled overnight in the fridge! I've copied the recipe here for my future reference.

Hokkaido Chiffon Cupcakes

(Adapted from Reirei of All That Matters, makes 10 cupcakes)
(A)
3 egg yolks
1/8 tsp salt
24g corn oil
24g milk
1/2 tsp vanilla extract
32g cake flour
1/8 tsp baking powder (sift together with cake flour)

(B)
3 egg white
1/4 tsp cream of tartar
50g caster sugar

(C)

90g chilled fresh milk
30g custard powder
1/2 tsp vanilla bean paste or extract
3/4 tbsp icing sugar (optional)
145g dairy whipping cream

Some Snow Powder (optional)

Method
1) Preheat oven to 175℃。
2) In a bowl, whisk egg yolks with salt. Then add oil, milk and vanilla extract, whisk till well-blended.
3) Fold in flour mixture and set aside.
4) In another bowl, beat egg whites , sugar and cream of tartar to stiff peak.
5) Scoop 1/3 of the egg white mixture to the yolk batter, fold well, then pour batter back to the remaining egg whites. Fold lightly till well-mixed.
6) Fill baking cases with about 30-32g of batter. Bake for 20 mins, then leave to cool.
7) In a separate bowl, mix milk, instant custard powder, vanilla paste and icing sugar till mixture is smooth.
8) Pour in whipping cream and beat till the thickness desired.
9) Using a piping tip, insert tip into the cake and pipe for 5 seconds. 3 to 4 seconds if you prefer less cream.
10) Sieve snow powder on top (optional) and chill cake before serving