Add butter to a large microwave-safe bowl. Heat until very soft but not melted.
Whisk in granulated and brown sugars. Let cool slightly.
Whisk in eggs and vanilla extract.
In a separate bowl, whisk together flour, baking soda, baking powder, and salt.
Use a small fine-mesh sieve to sift in the matcha powder, then whisk again.
Add dry ingredients to wet.
Stir in chocolate chips.
Use a 1.5 tablespoon cookie scoop to generously scoop out cookie dough, then roll into balls.
Place balls on parchment-lined sheet pan with 2 inches of space around them.
Bake for 10-12 minutes, until just starting to brown around the edges.
Remove baking sheet from oven, and bang it on the counter 2-3 times.
Let sit on baking sheet for 2 minutes, then remove and let cool on a rack.
Notes
Storage Tips: These cookies will keep at room temperature in an airtight container for 2-3 days after baking. You can also freeze them for up to 3 months.Expert Tips: The reason we bake these cookies at 325 degrees Fahrenheit is that matcha cookies brown easily in a hot oven. A lower baking temperature helps maintain the glorious green color! Take out of the oven just as soon as you see any browning around the edges of the cookies.We love the bang-on-the-counter trick for making the best chewy matcha white chocolate cookies around. It flattens the cookies a bit as they cool, making them a little more dense and chewy. Works with chocolate chip cookies, and with these as well!