Measure 3 tablespoons of milk into a cup and microwave for about 20 seconds until warm.
Put the chai tea bag into the warm milk and put aside to steep while you get the rest of the chai mug cake ready.
Measure out the flour, sugar, and baking powder in a small bowl.
Add the oil and mix in.
Squeeze out the tea bag into the milk, and pour the chai milk into the bowl with the other ingredients.
Mix everything together.
Spray a mug or ramekin, and pour in the chai cake batter.
Microwave for 60 seconds; check and if it needs more time, add 15 seconds at a time until cooked.
Enjoy this chai spice mug cake with a side of chai tea or a chai latte!