marble cake (+milk)

Ingredients
116g butter,softened
116g sugar
100g eggs, beaten
100g flour
3g baking powder
a pinch of salt
15g milk
Method
1. Pre-heat oven to 170 degree celcius.
2. Beat butter at medium speed till creamy, add sugar & beat till light and fluffy.
3. Add eggs one small portion at a time, whisk well after each addition.
4. Gently fold in sieved flour, baking powder & salt, in 3 batches, alternating with 2 batches of milk.
5. Pick up a scoop of the mixture and gently fold in sieved cocoa powder and the milk. Place both mixture alternative into baking tray, then use a wooden pick to creat swirls in the mixture.
6. Bake at 170 deg celcius for 20 mins or until the top is golden.