Rita's Old-Fashioned Butter Cake ( egg separation method)

This recipe it's my 1st ever butter cake that I ever known of when I was 15 with my sisters.  This is a family butter cake that everyone's love back then. We used to bake it plain. 

It's a huge cake that we bake with a 9" pan.  Today I bake with 2 different pan.  It rises beautifully. I stick to one plain and one marble butter cake.  Simply yummy.

Rita's Old-fashioned Butter Cake

A

340g unsalted butter 

150g sugar

B

9 eggs yolk

C

340g flour

2tsp Double baking powder 

D

9 eggs white

100g sugar

1/4tsp COT

* Line base and grease side 6" and 9" round pan.

* Beat A until double in size. 

* Add in B one at a time. 

* Add C fold gently with hand mixer until well combined.  

* Beat D soft to stiff peak. Fold 3 times separately into batter.  

* Split into 2 bowl.  

* Take 1/3 cup out from 1 bowl, mix with 1tbsp coco powder / chocolate paste mix well. 

* In 6" round pan, alternately mix with white batter n use a butter knife to create the marble effect. 

*  For 9" just pour in the plain batter into pan.

* Bake 170°c for 70-80 minutes.  

* Removed from oven and let it cool.