In your favorite microwave-safe mug, whisk together the 2 tablespoons of all-purpose flour, 1/8 teaspoon of baking powder, and 1 tablespoon of sugar until well blended.
Pour in the 1 tablespoon of melted butter and 1 1/2 tablespoons of milk to the dry mixture. Mix until all the ingredients are combined and no dry flour is visible.
Gently fold in the 1 teaspoon of chocolate chips, ensuring they are evenly distributed throughout the batter.
Place the mug in the microwave and cook on high for 40-60 seconds. Start with 40 seconds, then check the cake. It should be set but still slightly moist in the center. If needed, continue microwaving in 10-second intervals until done.
Let the mug cake cool for a minute before digging in. You can top it with a scoop of ice cream, a dollop of whipped cream, or enjoy it plain!
