Begin by selecting a large microwave-safe mug to ensure there's enough space for the cake to rise. In the mug, combine the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, and a pinch of salt. Use a fork or a small whisk to stir these dry ingredients together until they are fully blended, avoiding any lumps.
Next, pour in the milk, vegetable oil, and vanilla extract. With the same fork, mix vigorously until you achieve a smooth batter, ensuring there are no dry pockets remaining at the bottom of the mug.
If you’ve opted to include chocolate chips, gently fold them into your batter at this stage. Make sure they are evenly dispersed throughout the mixture to ensure pockets of melted chocolate in every bite.
Place the mug in your microwave and cook on high power for approximately 1 minute and 30 seconds. Keep an eye on the cake as it cooks; the time may vary based on the wattage of your microwave. Your mug cake is ready when it has risen, is set in the center, and maintains a slight moistness—avoid overcooking for the best texture.
Once cooked, carefully remove the mug from the microwave (it will be hot!). Allow it to cool for about a minute. For a delightful finish, consider topping your mug cake with a scoop of whipped cream, a dollop of ice cream, or a rich drizzle of chocolate sauce.
Notes
Serve directly in the mug for a cozy experience or transfer to a plate for elegance. Top with whipped cream or chocolate sauce for added indulgence.