In a microwave-safe mug, add flour, sugar, baking powder, and matcha powder. Whisk until evenly blended and no lumps remain. You want to make sure to break apart any matcha or flour lumps before adding the liquid.
Add heavy cream, milk, oil and water. Whisk batter until smooth. Cook in the microwave at full power for about 1 minute. Allow cake to cool a few minutes before eating. Dust top with powdered sugar if desired.
The recipe above makes a small cake, about the size of an unfrosted cupcake. For the photos, I did 1.5 times the recipe in an 8 oz mug so that you can see the cake above the rim of the mug. If you wish for the bigger version, just multiply ingredients by 1.5 and cook for about 1 minute 30 seconds.
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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.