Preheat oven to 350°F/177°C.
Line a 9″ by 13″ baking sheet with parchment paper.
In a medium bowl, add egg yolks, 1 tablespoon sugar and beat with a whisk until lightened in colour.
Add in the matcha, vanilla extract, milk, avocado oil and whisk to combine.
Sift in the cake flour and mix until just combined. Set aside.
In a clean stand mixer bowl fitted with a whisk attachment, add the egg whites and whisk on low-medium speed. When it becomes foamy, add in the cream of tartar.
Slowly increase the speed and gradually add in the 2 tablespoon sugar. Keep whisking until stiff peaks.
Fold about ⅓ of the egg whites into the flour mixture to lighten.
Fold in the remaining egg whites into the flour mixture, until there is no white streaks remaining, but being careful not to deflate too much of the batter.
Transfer the batter to the prepared baking sheet and smooth out the top using an offset spatula. Drop the pan from a height of 1' to release any trapped air bubbles.
Bake at 350°F/177°C for 12-14 mins, or until the cake is springy to the touch.
Remove cake from the oven and drop the pan from a height of 1' to prevent the cake from shrinkage.
Let cool on a cooling rack for about 20 minutes.
Use a small 2.5" cookie cutter to cut out rounds. You should end up with 12 rounds.