Preheat oven to 350°F/177°C.
In a large glass bowl, combine the melted butter, egg, brown sugar and granulated sugar. Whisk until everything is combined.
Sift in the flour, almond flour (if using), baking soda, and matcha to the butter mixture and use a spatula to mix until it forms a dough.
Tip: if you press the dough together, it should stick nicely into a ball and not crumble apart. If it appears too "wet," add 1 tablespoon of flour and mix again.
Fold in the matcha chocolate chips to the cookie dough and mix until all of the chips are dispersed throughout the dough.
Chill the dough in the fridge for 10 minutes.
Use a small ice cream scoop to portion the cookie dough into 6 balls, about 40-42g each. Roll the balls with your hands and place onto a parchment-lined baking sheet or cookie sheet.
Press in additional matcha chocolate chips on the tops of the cookies and chill in the refrigerator for another 15-20 minutes.
Bake the cookies for 10-12 minutes at 350°F/177°C, until slightly puffy, dry, and slightly golden in colour. Don't overbake. The cookies should still retain a nice green colour from the matcha.
Cool for 10 minutes on the baking sheet and carefully transfer the cookies onto a wire rack to cool completely.