makes about 36 mini-cookies (1″ diameter)
light green swirl:

• 1/4 cup (2 oz, about 56 g, or 1/2 stick) unsalted butter, room temperature
• 3 tbsp confectioners’ sugar
• 1/2 egg yolk (optional)
• 1/4 tsp almond extract
• 1/2 cup (about 63 g) all-purpose flour
• 1/2 tsp matcha powder
• 1 pinch of baking powder
• 1 small pinch of salt

dark green swirl:

• 1/4 cup (2 oz, about 56 g, or 1/2 stick) unsalted butter, room temperature
• 3 tbsp confectioners’ sugar
• 1/2 egg yolk (optional)
• 1/4 tsp almond extract
• 1/2 cup (about 63 g) all-purpose flour
• 1 tsp matcha powder
• 1 pinch of baking powder
• 1 small pinch of salt
• Matcha Shortbread Cookies, without Swirl
• 1 stick unsalted butter, at room temperature
• 6 tbsp confectioners’ sugar
• 1 egg yolk (optional)
• 1/2 tsp almond extract
• 1 cup all-purpose flour
• 1 1/2 tsp matcha powder (increase for a stronger matcha flavor)
• 1/8 tsp baking powder<>/li>
• 1 pinch of salt