These matcha Shiroi Koibito cookies consists of two thin and crispy pieces of matcha cookies with a delicious white chocolate filling.

Making the cookie portion

The cookie portion of Shiroi Koibito is very simple. It consists of basic ingredients:

butter
powdered sugar
egg white
flour
matcha powder

For this cookie it is actually recommended to use a mold. I got mine off Aliexpress. I have seen others with success piping the batter out by hand but it is a tedious process and you end up with messier looking cookies.

To make the cookies:

Mix together the butter and sugar until it is light and pale in color.
Add in the egg white and mix it well
Sift in the flour and matcha. Mix until combined.
Once the batter is complete, transfer it to the molds. You can do this by either piping the batter into each individual cavity or using a spoon or spatula to fill in each cavity.
Use a bench scraper or spatula to smoothen out the top of each cookie.
Remove the mold to reveal the cookies
Repeat this process until you have no more batter
Bake the cookies at 170C/338F for 9-10 minutes.

White chocolate filling

The filling is simply white chocolate. To fill the cookies with white chocolate, we first have to melt the chocolate.

There are 2 ways you can melt the white chocolate:

Microwave Method: Add chocolate into a microwave safe bowl and microwave in 15 second intervals until the chocolate is melted
Double Boiler Method: Add white chocolate into a bowl and place the bowl over a pot of simmering water. You want the bowl to be large enough to sit over the top of the pot and ensure the bottom of the bowl isn’t in contact with the water. Stir the chocolate with a spatula until it is melted.

Transfer the melted chocolate into the same molds you made the cookies in. You can do this by either piping the chocolate into the molds or spooning it in with a spoon. Do be careful if you are piping it in because the chocolate will be hot!

Pop the chocolate into the freezer for ~15 minutes for the chocolate to set. Once the chocolate has set, it should pop right out of the molds.

Matcha Shiroi Koibito Assembly

Sandwich a piece of white chocolate between two pieces of cookie:

Take a cookie and dab a bit of melted chocolate onto it. This will act as a glue to hold the cookie and chocolate together.
Place a piece of white chocolate on top
Dab it with more white chocolate then place another cookie on top to create a cookie sandwich.

Enjoy!