In a microwave safe mug, add Oat flour, matcha, sugar, baking soda, salt and mix with a fork.

Add milk, vegetable oil, vanilla extract and whisk again with a fork till there are no lumps and the batter is smooth.

Sprinkle some dark chocolate chips on top (if using).

Make sure that the batter is less than 1/2 the capacity of the mug.

If its more, the batter will overflow from the mug when the cake rises during cooking.

Place the mug into the microwave and cook for 2 mins at micro high. (The high setting in mine is 900 W).

Let the mug rest in the microwave itself for at least 1/2 minute.

If you open the door immediately, the cake will deflate and sink in.