Preheat the oven to 180 degrees C (350 degrees F). Line a small loaf pan all sides up.
Butter (2/3 cup)
Caster Sugar (1/2 cup)
till light and fluffy with an electric mixer. Gradually add the
Small Eggs (2)
Yolk into it, followed by
Vanilla Extract (1 tsp)
and mix well.
All-Purpose Flour (1 cup)
Baking Powder (1 tsp)
. Fold well with a rubber spatula. Take out a third of the batter into a bowl and fold well with the
Unsweetened Cocoa Powder (2 1/2 Tbsp)
Milk (1 1/2 Tbsp)
Layer the plain and chocolate batter (3 each) alternately into prepared pan or lightly swirl the batters with a fork to create marbling effects.
Bake in preheated oven at 180 degrees C (350 degrees F) for 15 minutes.
Lower temperature to 160 degrees C (325 degrees F) for another 20-25 minutes. Leave cake in pan until completely cool before slicing. Enjoy!