The unique flavor combination of bitter matcha, tangy ruby chocolate, and sweet white chocolate in these Ruby White Chocolate Matcha Sable Cookies is surprisingly delightful!
Using a mixer or spatula, mix butter and confectioners sugar until combined. Add egg yolk and vanilla extract. Mix until well combined.
Sift in cake flour, matcha powder, and salt. Add almond flour and mix with a spatula until well incorporated. Add finely chopped chocolate and mix until well combined.
Refrigerate the dough for 20-30 minutes if it is too sticky. If not, you can skip this step.
Press the dough into two logs, about 1.2-inch/3.cm in diameter. Wrap the dough with parchment paper or plastic wrap and chill until very firm for at least 2 hours.
Preheat the oven to 340F/170°C and line two baking pans with parchment paper or silicone mat.
Slice the log into a 1/2-inch or about 1.2 cm thick with a sharp knife. Arrange the slices on the baking pan, spacing 1-inch apart.
Bake for 15-18 minutes or until the bottom edges of the cookies are golden brown in color.