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Shiroi Koibito Cookies

Shiroi Koibito cookies are thin, delicate langue de chat wafers sandwiching melted ivory white chocolate. Beat butter and powdered sugar until pale and fluffy, then bake until edges are barely golden for a snow-like, crisp finish.
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Prep Time 45 minutes
Cook Time 10 minutes
Total Time 55 minutes
Servings: 8 servings
Course: Dessert
Cuisine: Japanese
Calories: 130
Ingredients Equipment Method Notes

Ingredients
  

Shiroi Koibito cookies
  • 1 cup all-purpose flour Use all-purpose flour for the signature thin wafer texture.
  • 0.5 cup unsalted butter, softened Softened butter creams more evenly for a pale, fluffy batter.
  • 0.33 cup powdered sugar Powdered sugar helps create a light, delicate cookie.
  • 2 egg whites Keep egg whites at room temperature for smoother mixing.
  • 0.5 tsp vanilla extract Adds a subtle aromatic sweetness to the batter.
  • 5 oz white chocolate, melted Melt to a smooth, glossy layer for sandwiching.

Equipment

  • 1 sheet pan

Method
 

Make the cookie batter
  1. Beat softened butter and powdered sugar until pale and fluffy, about 2-3 minutes, for a light batter.
  2. Whisk in egg whites and vanilla extract until smooth and fully combined, scraping the sides as needed.
  3. Fold in all-purpose flour until just combined, then stop as soon as no dry streaks remain to keep the batter thin.
Bake the wafers
  1. Spread the batter into thin ovals on a lined sheet pan using an offset spatula so they bake evenly.
  2. Bake at 325°F for 8-10 minutes, until the edges are barely golden and the centers look set but not browned.
  3. Cool completely so the wafers firm up and don’t crack when you add the chocolate.
Assemble and set
  1. Spread melted white chocolate on one cookie in a thin, even layer, then top with a second cookie.
  2. Let the sandwich cookies rest until the chocolate sets, leaving a glossy center when sliced or bitten.

Notes

Pro tip: spread the batter very thin with an offset spatula for the signature delicate, crisp langue de chat texture. Store in an airtight container in the fridge for up to 5 days; bring to room temperature before serving. Freezing isn’t recommended because the wafers can lose their delicate texture after thawing. For a gluten-free swap, use a 1:1 gluten-free all-purpose flour blend (the texture may be slightly less crisp).