Prep: Line a baking sheet with parchment.
Mix Dry: Whisk flour, matcha, arrowroot, baking powder, baking soda, and salt.
Cream Butter + Sugar: Beat the softened butter until creamy. Add sugar and beat 3–4 minutes until pale and fluffy.
Add Egg + Vanilla: Beat until smooth and combined.
Add Dry Ingredients: Mix until just combined — a few flour streaks are okay.
Fold in Macadamia Nuts & Scoop & Roll: Use a spatula and don’t overmix. Roll out your cookie dough balls and place on parchment.
Chill the Dough (THE IMPORTANT PART): Cover the bowl and chill at least 1 hour.This stops spreading and gives the thick, soft-center cookie you love. Preheat your oven to 350 degrees 30 min before you take the cookies out from being chilled. Allow cookies to sit at room temp for 15-30 min before baking. Bake 12–14 minutes: Until edges are set and centers look soft/puffy. They will finish setting on the sheet. Let cool on the tray for 10 minutes before moving.