You can use cooking oil, cooking spray, or butter. The mug needs to be between 12 and 16 ounces (350 and 475 milliliters), otherwise, the cake may overflow and create a mess., Pour the flour into the mug, then add the sugar, baking powder, and salt. Mix everything together with a fork., Crack an egg into the mug, then pour in the oil and lemon juice. Mi everything together with a fork until the yolk break and there are no more streaks.

For extra flavor, add in ½ teaspoon of vanilla extract., This is not absolutely necessary, but it will give the cake more flavor and texture. For even more texture, you could add in 1/2 teaspoon of poppy seeds as well.Mix everything well with a spoon. Scrape the bottom and sides of the mug so that everything gets mixed in., It will take about 1½ to 2 minutes, but you will want to check the cake after 1½ minutes. It is ready when it has risen slightly and the center has set., You can let it cool all the way, or wait 2 to 3 minutes, and eat it while it is still warm. For an a nicer touch, sprinkle some icing sugar and lemon zest on top of the cake.For a fancier cake: also mix ⅓ cup (40 grams) of powdered sugar with ½ teaspoon of freshly-squeezed lemon juice, and drizzle it over the top of the cake instead.
Grease the inside of a large, microwave-safe mug.
Combine the dry ingredients in the mug.
Add in the wet ingredients.
Add in some lemon zest.
Cook the cake on HIGH in the microwave.
Allow the cake to cool before serving it.
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