Preheat oven to 350 degrees. Line a large baking sheet with parchment paper.
Mix the flour, baking soda, salt, and sifted matcha in a medium bowl.
Use a stand mixer with the paddle attachment or a handheld mixer on medium speed to cream the butter, brown sugar, and granulated sugar. Reduce the speed to low. Add the eggs and vanilla extract, mix just until combined. Scrape the bowl and beater down as needed.
Add the dry ingredients to the wet mixture in several increments on low or stir speed. Mix just until combined, scraping the bowl and beaters down as needed. Stir in the white chocolate chips.
Use a 1½ tablespoon scoop to drop the dough balls on a parchment-covered baking sheet. Leave about 2 inches of space between them. Bake for 10-11 minutes or until very lightly brown on the edges and set.
Notes
Store the cookies in an airtight container at room temperature for up to 5 days.
Freeze baked cookies in a freezer-safe container for up to 3 months.
Flash freeze matcha cookie dough balls in a freezer-safe container or freezer bag for up to 3 months. Bake from frozen.