Butter Cake (Cotton Texture)

Ingredients:

190g    Salted Butter (Softened & cut into small pcs)
75g      Castor Sugar
45g      Egg Yolks
3/4 tsp Vanilla Extract
150g    Self-raising flour (Sifted)
50ml    Fresh Milk (Full fat)

105g    Egg Whites
30g      Castor Sugar


Method:
1)   Preheat oven at 170 degree celsius.
2)   Prepare a 6" square pan with parchment paper.
3)   Cream butter with castor sugar till pale & fluffy.
4)   Add egg yolk 1 at a time; plus vanilla extract with last egg yolk.
      Creamed about 1 minute.
5)   Re-sift 1/4 flour into butter mixture.
6)   Fold with spatula till just even.
7)   Then the other 1/4 flour.
8)   Add-in  1/2 of the milk. Fold till fully absorbed.
9)   Then the other 1/4 flour.
10)  Followed by the milk, then the flour as the same procedure.
11)  In a separate mixing bowl, whisk egg white and sugar till stiff peaks.
12)  Divide into 3 batches, then fold into the flour mixture evenly.
13)  Pour into the baking pan. (Bang cake pan 2-3 times against worktop
       to release the air.
14)  Bake for 35 minutes. Then increased to 180 degree celsius.
       Continue bake for 10 minutes.