This easy peanut butter mug cake is fudgy, moist, made in the microwave, and ready in under 5 minutes. Add in some chocolate chips or an extra drizzle of peanut butter on top for the most delicious mug cake recipe.
Add the oil, peanut butter, sugar & egg yolk to a large mug. Whisk together until smooth.
Whisk in the flour and baking powder.
Stir in the milk and optional chocolate chips
Microwave for 1 minute and 30 seconds or until the top looks set.
Let stand for 1-2 minutes to cool slightly, then top with ice cream or a drizzle of peanut butter.