Whisk all ingredients into a small bowl until smooth batter forms. Line a large round microwave-safe plate with parchment paper. Using a small spatula, scoop out batter into middle of the plate. The batter will be quite wet but you should be able to pour the cookie batter so that it forms a round disk, like a cookie shape or a thick pancake. Smooth surface with spatula if needed.
Cook in microwave for about 50 seconds. Careful not to cook longer, as it will make cookie hard in the center. Let cookie cool a few minutes before eating.
Notes
For the matcha green tea, the higher the quality, the better the green color. I like Maeda-En gold canister quality.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.