Castella Cake: the easy Japanese recipe for a fluffy dessert

Pro tips

• Whip egg whites to stiff peaks and fold into the batter in two additions—this preserves air and ensures a fluffy crumb.
• Use room-temperature eggs and softened butter; cold ingredients won't incorporate smoothly and trap air effectively.
• Don't open the oven door for the first 25 minutes; sudden temperature drops collapse the rising cake.
• Invert the hot cake onto a wire rack immediately after baking to prevent it from sinking as it cools.

Substitutions

• Butter → neutral oil (90 ml), though the flavor will be milder
• Honey → granulated sugar (90g) or agave syrup (85g)
• Vanilla extract → omit entirely, or use 1 tsp almond extract for variation

Storage & make-ahead

Cool completely, wrap tightly, and store at room temperature for 3 days or refrigerate for up to 1 week. Slice with a serrated knife.

Equipment

8-inch square or round cake pan · Electric mixer or whisk (for whipping egg whites)

Why is my Castella Cake dense instead of fluffy?

Over-mixing the batter or deflating the egg whites during folding causes density. Fold gently and only until streaks of white remain. Also ensure eggs are at room temperature for better volume when whipped.

Can I make Castella Cake without honey?

Yes. Use an equal weight of granulated sugar (90g) or reduce slightly and use a liquid sweetener like agave. Honey adds mild flavor; substitutes will lighten it slightly.

How do I know when Castella Cake is done baking?

A toothpick inserted in the center should come out clean or with just a few moist crumbs. The top should spring back when lightly touched. Bake time varies by oven; check at 35 minutes, then every 2–3 minutes.

How should I store Castella Cake?

Cool completely, wrap tightly in plastic wrap or store in an airtight container at room temperature for up to 3 days, or refrigerate for up to 1 week. Slice with a serrated knife for clean cuts.

Can I scale this recipe up or down?

Yes, scale all ingredients by the same ratio. Keep proportions identical: 5 eggs to 90g flour/butter/sugar. Adjust bake time slightly if pan size changes significantly.