This brownie in a mug is a quick and easy single-serving dessert made in the microwave, delivering a rich, chocolatey treat in just minutes using simple pantry ingredients.
Choose a microwave-safe mug that holds at least 12 ounces.
Add flour, sugar, cocoa powder, and salt to the mug and mix well with a fork.
Add vegetable oil, milk, and vanilla extract, then stir until just combined.
Fold in chocolate chips if using.
Microwave on high for 60–90 seconds depending on wattage until edges are set but center is slightly soft.
Let sit for 1 minute before eating.
Notes
Do not overmix to avoid a tough texture. Microwave times may vary depending on wattage—slightly undercook for a gooey center. Let sit for 1 minute before eating. Best enjoyed immediately.