In a large mixing bowl, cream together unsalted butter and sugar until light and fluffy, about 3–5 minutes. Add eggs and vanilla extract, beating well to combine.

In a separate bowl, whisk together all-purpose flour, baking powder, and salt; gradually incorporate into the wet mixture until just combined.

Divide dough into three equal portions. Color one portion with matcha powder, the second with strawberry powder, and leave the third as vanilla base. Avoid overmixing.

Use color block or spiral method to shape the cookies, creating distinct swirls.

Preheat oven to 350°F (175°C) and line baking sheets with parchment paper. Place shaped cookies on sheets, spacing an inch apart. Bake for about 9 minutes.

Allow cookies to sit on the tray for about 5 minutes before transferring to a wire rack to cool.