Zebra Butter Cake/ Marble Zebra Cake

This post is non-korean dish related but I have to write down the recipe here because the result is so yummy!  This is definitely a keeper!  Found this recipe online thanks to the homecook group that I join in FB :)

Size: 6" round
Ingredients:
110g Butter
70g Brown Sugar
2 Eggs
30ml Milk
40g Chocolate (melted) or [25g cocoa powder melted & mix in some warm water]
1/8 tsp Salt
100 Cake flour or [Self-rising flour), I used cake flour

1. Cream butter and brown sugar in a mixing bowl until creamy.
2. Add in eggs, one at a time, beating well after each addition.
3. Add in milk, mix well.
4. Add in cake flour gradually until all well incorporated.
5. Break chocolate into smaller pieces in a bowl, prepare a pot of water, let the water simmer over medium low heat, put the bowl of chocolate on top of the pot and wait until the chocolate melts.  Stir occasionally with a spoon. Cool down the melted chocolate.  **It will be easier if you use cocoa powder (cocoa powder mix well with some warm water), I didn't have it in my pantry so I used chocolate :)
6. Once the chocolate cool down a bit, scoop half of the batter into the bowl and mix well.
7. Use about 2 tbsp of each batter to create the layers of batter on the pan.  Begin from the middle of the pan, take 2 spoon of white batter then over it add 2 spoon of white batter.  Repeat these steps until all batter has been used.
8. Bake in preheated oven at 170 degree celcious for 35-40 mins or until cooked.  *Test with a toothpick, if the toothpick come out clean then it's cook ;)

**Step by step photos will be updated the next time I make this cake...didn't take the pictures as this is actually my first attempt ^^