Fluffy Castella Sponge Cake

Ingredients:

(For about 8–10 cupcakes or one small loaf pan)

5 large eggs (room temperature)

100 g (½ cup) sugar

80 g (⅔ cup) cake flour (sifted)

60 ml (¼ cup) whole milk (warm)

60 ml (¼ cup) vegetable oil (or melted unsalted butter)

1 tsp honey (optional, for extra moisture and flavor)

1 tsp vanilla extract

Pinch of salt

🥣 Instructions:

  1. Prepare the setup

Preheat oven to 160°C (320°F).

Line muffin tins (or a loaf pan) with parchment or cupcake liners.

Heat milk and oil together slightly (warm, not hot).

  1. Make the batter

Separate the egg whites and yolks.

In a large bowl, whisk yolks with half the sugar until pale.

Add warm milk-oil mixture, vanilla, and honey — whisk well.

Gently fold in sifted cake flour and salt until smooth.

  1. Beat the egg whites

In a clean bowl, beat the egg whites with an electric mixer until foamy.

Gradually add the remaining sugar and whip to soft glossy peaks.

  1. Combine

Fold the meringue gently into the yolk mixture in three additions.

Use a spatula and mix in a circular motion — don’t deflate the batter.

  1. Bake

Pour into the prepared liners or pan.

Tap lightly on the counter to remove air bubbles.

Bake 25–30 minutes (cupcakes) or 40–45 minutes (loaf) until golden and springy.

  1. Cool

Let cool slightly in the pan before removing.

For extra softness, cover with plastic wrap while cooling.

🍯 Tips for Perfect Fluffiness

Don’t overmix after adding the flour or meringue.

Room-temperature eggs whip better.

Avoid opening the oven early.

For a moister texture, add 1 tsp honey or condensed milk.

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