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Shiroi Koibito Cookies

Shiroi Koibito cookies are crisp langue de chat-style sandwich cookies with a thin layer of melted white chocolate. The batter bakes into light golden ovals, then you sandwich for a crisp-to-melt bite with a clean, snappable chocolate center.
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Prep Time 20 minutes
Cook Time 8 minutes
Total Time 28 minutes
Servings: 8 servings
Course: Snack
Cuisine: Japanese
Calories: 140
Ingredients Equipment Method Notes

Ingredients
  

unsalted butter
  • 0.5 cup unsalted butter, softened Soften so it creams smoothly.
powdered sugar
  • 0.5 cup powdered sugar Use powdered sugar for a fine, crisp cookie texture.
egg white
  • 1 large egg white For structure and a delicate bite.
all-purpose flour
  • 0.75 cup all-purpose flour Measure accurately for tender, crisp cookies.
cornstarch
  • 0.25 cup cornstarch Adds tenderness while keeping the cookies crisp.
vanilla extract
  • 1 tsp vanilla extract Adds a subtle aroma.
white chocolate
  • 6 oz white chocolate, melted Melt until smooth for neat sandwiching.

Equipment

  • 1 sheet pan

Method
 

Mix the cookie dough
  1. Cream the softened unsalted butter and powdered sugar until fluffy, then beat in the egg white and vanilla extract until smooth and cohesive.
  2. Fold in the all-purpose flour and cornstarch until a smooth batter forms, without overmixing.
Bake the cookies
  1. Spread the batter into thin oval shapes on a lined sheet pan, keeping the thickness even for crisp edges.
  2. Bake at 350°F for 6-8 minutes, until the edges turn light golden and the centers look set.
Assemble with white chocolate
  1. Cool the cookies completely on the tray before assembling, so they don’t soften or crack.
  2. Spread melted white chocolate onto one cookie and sandwich with another, aligning the ovals.
  3. Let the chocolate set at room temperature before serving, until it feels firm and snaps cleanly.

Notes

For best crispness, spread the batter very thin so the baked edges stay light and golden. Store cookies in an airtight container at room temperature for up to 3 days; for longer keeping, freeze assembled cookies up to 2 months. For a dairy-free swap, use a plant-based butter in the same amount and confirm the white chocolate is dairy-free.