Preheat oven to 350°F. Line baking sheets with parchment paper.
In a large bowl using a hand mixer or stand mixer, cream unsalted butter, softened, softened butter, granulated sugar, granulated sugar, and packed brown sugar, brown sugar together on medium-high speed for 3 minutes until light and fluffy.
1/2 cup unsalted butter, 1/3 cup granulated sugar, 1/2 cup packed brown sugar
Add large egg egg, egg yolk egg yolk, honey honey, and vanilla extract vanilla extract. Beat until well combined, about 1 minute.
1 large egg, 1 egg yolk, 1 tablespoons honey, 1 teaspoons vanilla extract
In a separate bowl, whisk together all-purpose flour flour, culinary-grade matcha powder, baking soda, salt, and cornstarch. Sift if your matcha or flour is clumpy, you want no dry pockets of matcha in the final dough.
1 & 1/2 ounces all-purpose flour, 2 & 1/2 ounces culinary-grade matcha powder, 1/4 teaspoons baking soda, 1/4 teaspoons salt, 1/2 tablespoon cornstarch
Add the dry ingredients to the wet ingredients and mix on low speed until just combined. The dough should be a vibrant green.
Fold in the semisweet chocolate until evenly distributed. Scoop dough using a 4-tablespoon scoop (about 65-70g each) and place 4-5 cookies per sheet, spacing 3-4 inches apart.
1 cup semi sweet chocolate chips or chunks
Bake for 10 minutes until edges are set but centers still look soft and slightly underdone. If cookies haven't spread much by the 8-minute mark, remove from oven and gently bang the pan on the counter 2-3 times, then return to oven.
As soon as cookies come out of the oven, press extra chocolate chunks into the tops while they're still warm and soft. Add a sprinkle of flakey sea salt if desired. Cool on baking sheet for 8 minutes (they'll continue setting up), then transfer to a wire rack.