Orange Chocolate Yogurt Marble Cake

Orange Chocolate Yogurt Marble Cake

Ingredients :

Orange Cake
125g cake flour
1/2 tsp baking powder
1/4 tsp baking soda
1/4 tsp salt
35g butter, soften
Zest from 1/2 orange
75g sugar
1 egg, lightly beaten
87g plain yogurt (this was half of what I was left with)
2 tbsp freshly squeezed orange juice

Chocolate Cake
125g cake flour
1/2 tsp baking powder
1/4 tsp baking soda
1/4 tsp salt
35g butter, soften
75g sugar
1 egg, lightly beaten
87g plain yogurt
2 tbsp milk (I use HL milk)
1 tbsp cocoa powder

Method :
* The method for both cake batters are similar.

Orange Cake
1. Mix yogurt and orange juice well.
2. Sieve flour, baking powder, baking soda and salt together. (I find that sieving salt may not be a good idea as it tends to stick to the flour and I had difficulty sieving it into the flour mixture. I suggest to beat the salt into the butter instead.)
3. Beat butter, sugar and orange zest till light and creamy.
4. Add egg gradually and beat till well mixed.
5. Fold in flour and yogurt mixture alternately (1/3 flour -> 1/2 yogurt -> 1/3 flour -> 1/2 yogurt -> 1/3 flour).

Chocolate Cake
1. Mix milk and cocoa powder together till all cocoa powder has dissolved. Warm up milk a little to help dissolve the cocoa powder, if needed. Mix the chocolate mixture into the yogurt till well incorporated.
2. Sieve flour, baking powder, baking soda and salt together.
3. Beat butter and sugar till light and creamy.
Steps 4 & 5 as above for Orange Cake.

To assemble, drop a spoonful of orange cake batter into the center of a 6" cake tin, follow by another spoonful of chocolate cake batter on top of it. Alternate the two batters until all are done.