Prepare Your Equipment: Begin by preheating your oven to 180°C (350°F) and greasing a cake pan, then dusting it with cornstarch to prevent sticking.
Beat the Egg Whites: In a mixing bowl, beat the egg whites until they form firm peaks. This is the secret to achieving that light, fluffy texture that cotton cake is known for!
Mix the Egg Yolks: In a separate bowl, combine the egg yolks, condensed milk, and cornstarch. Beat until you achieve a smooth, light, and homogeneous cream.
Combine Mixtures: Gently fold the beaten egg whites into the yolk mixture using a spatula. Be careful to fold from the bottom upwards to maintain that airy texture.
Pour and Bake: Transfer the batter into your prepared cake pan, smoothing the top. Bake in the preheated oven for about 20 to 25 minutes or until the top is lightly golden.
Test for Doneness: Perform the toothpick test—insert a toothpick in the center. If it comes out clean, the cake is ready!
Cool and Serve: Allow the cake to cool for a few minutes before removing it from the pan. Dust with powdered sugar or add your favorite topping before serving.