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Easy Castella Cake Recipe | Fluffy Japanese Sponge Cake

Make Castella cake with this easy recipe. A soft, fluffy Japanese sponge cake with delicate sweetness and moist texture—perfect for dessert, tea time, or gifting.
Prep Time 20 minutes
Cook Time 1 hour
Total Time 1 hour
Course Dessert, Tea-time snack
Cuisine Japanese wagashi, Portuguese-inspired sponge cake
Servings 10 slices
Calories 180 kcal

Equipment

  • Rectangular loaf pan
  • Mixing bowls
  • Electric mixer
  • Whisk
  • Parchment paper
  • Cooling rack

Ingredients
  

Base Ingredients

  • 1 cup bread flour
  • 1 cup sugar
  • 4 large eggs
  • 3 tbsp honey or mizuame syrup

Optional Additions

  • 2 tbsp matcha powder (for earthy flavor)
  • 2 tbsp cocoa powder (for chocolate variation)
  • ½ cup cream cheese (for savory twist)
  • 2 tbsp zarame sugar (for crunchy base)
  • Ingredient Tip: Bread flour provides structure, while honey adds moisture and depth.

Instructions
 

  • Prepare Pan – Line loaf pan with parchment paper.
  • Whip Eggs & Sugar – Beat eggs and sugar until pale and fluffy.
  • Add Honey & Flour – Warm honey slightly, fold into egg mixture, then sift and fold in flour gently.
  • Pour Batter – Transfer to pan, tap lightly to release air bubbles. Sprinkle zarame sugar if desired.
  • Bake – Bake at 160°C (320°F) for 50–60 minutes until golden.
  • Cool & Rest – Cool in pan for 10 minutes, transfer to rack, wrap in plastic, and rest overnight.
  • Slice & Serve – Cut into neat slices and enjoy with tea or coffee.

Notes

  • Make-Ahead: Best enjoyed after resting overnight.
  • Variations: Try matcha, chocolate, or cheese for unique flavors.
  • Serving Idea: Present in decorative boxes for gifting.
  • Storage: Keeps 3–4 days at room temp, up to a week refrigerated, or 2 months frozen.
Keyword Castella cake recipe, honey sponge loaf, Japanese sponge cake, moist sponge cake, Nagasaki kasutera, wagashi dessert