01 -
In a large microwave-safe mug, whisk together the flour, sugar, cocoa powder, baking powder, and salt until well combined.
02 -
Stir in the milk, vegetable oil, and peanut butter until the batter is smooth and fully incorporated.
03 -
Microwave the mug on high for 1 minute and 10 seconds. The cake will rise and then slightly deflate as it cools.
04 -
Let the cake cool for a minute before adding optional toppings like whipped cream or ice cream. Enjoy directly from the mug.