Ingredients
For the Chocolate Sponge:
1 ½ cups all-purpose flour
½ cup unsweetened cocoa powder
1 ½ tsp baking powder
½ tsp baking soda
½ tsp salt
1 cup sugar
½ cup vegetable oil (or melted butter)
2 large eggs
1 tsp vanilla extract
1 cup buttermilk (or milk + 1 tsp vinegar)
For the Cream Filling:
