In your microwave-safe mug, combine the 4 tablespoons of all-purpose flour, 2 tablespoons of granulated sugar, and 1/2 teaspoon of baking powder. Mix well with a fork or whisk to ensure there are no clumps.
Next, add in the 4 1/2 tablespoons of nondairy milk, 1 1/2 tablespoons of oil, and 3/4 teaspoon of vanilla extract. Mix everything together until you have a smooth batter. If you’re feeling adventurous, this is the time to fold in some vegan chocolate chips or sprinkles for that extra flair.
Place the mug in the microwave and cook on high for about 1 minute and 30 seconds. Keep an eye on it, as microwaves can vary in power. The cake is done when it has risen and looks set in the center.
Carefully remove the mug from the microwave (it will be hot!). Let it cool for a minute or two before indulging. Top your Vegan Mug Cake with some vegan whipped topping or a scoop of vegan ice cream if you desire.