The chocolate chips cause a cracking surface so if you don't like it, just skip them.

The process of making the chocolate sponge is quite similar with the traditional Castella sponge but it tastes amazing and totally worthy, especially for chocolate lovers like me. So, give it a try.

**** The Chocolate Castella Sponge Cake Recipe (for 15 x 15 cm rectangular mold)****

4 eggs
50g vegetable oil
70g milk
43g all purpose flour
17g cocoa powder
60g sugar
50g chopped chocolate
chocolate chips for decoration

My baking and camera equipments: https://www.amazon.com/shop/thythan

I use the oven themometer to check the inside oven temperature. Because some ovens might have a discrepancy between the display number and real temperature inside the oven.

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