Follow these simple steps to make your Microwave Mug Brownie:

1. Gather Your Ingredients: Measure out all the ingredients and place them in a microwave-safe mug.
2. Mix Dry Ingredients: In the mug, combine the flour, sugar, cocoa powder, baking powder, and salt. Stir well to ensure there are no lumps.
3. Add Wet Ingredients: Pour in the milk, vegetable oil, and vanilla extract. Stir until the mixture is smooth and well combined.
4. Add Extras: If desired, fold in chocolate chips, nuts, or a dollop of peanut butter at this stage.
5. Microwave: Place the mug in the microwave and cook on high for 1 to 1.5 minutes. The brownie should rise and firm up but remain slightly gooey in the center.
6. Cool Slightly: Allow the brownie to cool for a minute or two before digging in—if you can wait that long!
7. Enjoy: You can eat it directly from the mug or transfer it to a plate if you prefer.

These straightforward steps make it easy for anyone to whip up a delicious Microwave Mug Brownie in no time!