Many chocolate sponge cake recipes use somewhat different methods to produce distinct outcomes.
Each sponge cake is prepared differently with ingredient substitutions that affect the outcome.
1⅓ cups All-purpose flour or pastry flour with reduced protein works. ½ cup Dutch-processed unsweetened cocoa powder
⅔ cups Granulated sugar ⅔ cups Brown sugar 1 tsp baking soda 1 tsp baking powder
½ teaspoon Salt ⅓ cup Vegetable oil 2 Eggs - at room temperature
⅔ cup Milk - at room temperature ½ cup Coffee - freshly brewed strong coffee, room temperature
Egg, oil, sugar, coffee, and milk should be room temperature. Whip them for 1-2 minutes