01 -
In a large microwave-safe mug, combine flour, sugar, cocoa powder, baking powder, and salt. Whisk thoroughly to blend evenly.
02 -
Add milk, vegetable oil, and peanut butter to the mug. Stir until the batter is smooth and fully combined.
03 -
Microwave on high for 1 minute and 10 seconds. The cake will rise and then settle slightly as it cools.
04 -
Allow the cake to cool slightly, then serve warm directly from the mug. Optionally top with whipped cream or ice cream.