This coconut sponge cake recipe is a light and airy dessert that's perfect for afternoon tea or a summer picnic. The cake is delicate and moist, with a subtle coconut flavor that's enhanced by a dusting of powdered sugar. To make this cake, you'll need flour, sugar, baking powder, salt, coconut milk, eggs, and vanilla extract. Beat the eggs and sugar together until light and fluffy, then add the dry ingredients and coconut milk alternately, mixing until smooth. Pour the batter into a greased cake pan and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool before dusting with powdered sugar and serving.