Add the vegetable oil (or melted butter), milk, and vanilla extract to the dry ingredients in the mug. Mix everything together until you have a smooth batter.
If you want, you can add some chocolate chips or chopped nuts to the batter for extra texture and flavor.
Place the mug in the microwave and cook on high power for about 60 to 90 seconds. The cooking time may vary depending on your microwave's wattage and the desired gooeyness of the brownie. Start with 60 seconds and then add more time if needed.
Be careful when removing the mug from the microwave as it will be hot. Allow the brownie to cool for a minute or two before enjoying.
You can eat the microwave mug brownie directly from the mug or transfer it to a plate. Optionally, you can top it with a scoop of ice cream, whipped cream, or a dusting of powdered sugar.
This quick and easy microwave mug brownie is perfect for satisfying your sweet cravings in no time. It's a fun and simple treat to enjoy on its own or with a scoop of your favorite ice cream. Happy cooking!