Chocolate Marble Cake

Preparation time: 10 minutes
Cooking time: 30 minutes
Makes one 8-inch cake

Ingredients

1 Cup Confectioners Sugar (powdered sugar)
1 Cup Self Raising Flour
1/2 Cup Olive oil (Can use vegetable oil too)
1 tsp Baking Powder
1 large Egg
1 tsp Vanilla extract
1 tbsp Cocoa Powder
1 tsp instant coffee powder
A pinch of salt
4 tbsp Coke

Method 

1. Preheat the oven to 350F (180C). Grease and line your baking tin with butter paper and flour it lightly.
2. In a large mixing bowl, combine eggs and sugar. Using a hand-held electric mixer or wire whisk beat until the mixture is creamy and light in color.
3. Add oil, and continue beating until well blended.
4. Sieve the flour, salt and the baking powder. Gradually add the flour mixture to the wet ingredients and beat just until the batter is smooth and the dry ingredients are thoroughly incorporated. Add Coke to adjust the consistency of battter. It should be not flowy but drop into a thick streak. DO NOT OVERBEAT to prevent air pockets from forming in the batter.
5. Divide the mixture into 2 equal portions. I added the Vanila essence to one part.
6. Add cocoa powder and coffee powder into the other part of the batter and mix well.
7. Layer the vanila and chocolate batter alternatively in the cake tin. 
8. Give a gentle swirl with a chop stick (with the tip of the chop stick touching the bottom of the pan).
9. Bake for about 30-35 minutes or till a skewer inserted in middle come out clean.
10. Mine cracked a bit at the top. It turned out to be very soft and spongy cake. Could top it up with chocolate sauce or frosting.