Gather flour, sugar, milk, butter, cocoa powder, and a small sprinkle of salt to make a basic yet decadent microwave brownie base.
In a microwave-safe mug or basin, whisk together flour, sugar, and cocoa powder until well combined for a smooth batter.
Add the milk and melted butter and stir until well combined and no lumps are visible, creating a rich, chocolatey batter.
Add some chocolate chips or almonds to your microwave brownie to give it a more individualised taste and texture.
Microwave the batter on high for one to two minutes, making sure it is set but still wet.
If a toothpick is inserted, it should come out clean. If necessary, adjust the microwave duration in 10-second increments.
Give the brownie a minute to cool down before savouring its warm, fudgy perfection. Serve with ice cream for an added treat.