Start by taking a microwave-safe mug and add the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, and salt. Mix these dry ingredients thoroughly with a small whisk or fork until they are well blended and no lumps remain.
Next, pour in the milk of your choice, followed by the creamy peanut butter, vegetable oil, and pure vanilla extract. Stir the mixture together vigorously until it transforms into a smooth batter, ensuring there are no dry pockets of flour left.
If you’re craving an extra chocolatey indulgence, gently fold in the semi-sweet chocolate chips now, allowing them to be evenly distributed throughout the batter.
Place the mug in the microwave and cook on high for 1 minute. After 1 minute, check the consistency of the cake; it should appear set but soft. If it’s still too wet, microwave for an additional 10-15 seconds. Remember, the cake will continue to cook slightly after removing from the microwave, so be careful not to overdo it!
Once cooked, let the mug cake sit for about a minute to cool slightly. For an added touch of whimsy, top your cake with a dollop of additional peanut butter or a swirl of whipped cream, and finish with a sprinkle of chocolate shavings for a delightful presentation.
Notes
For a richer flavor, top with additional peanut butter or whipped cream.