The Possible Reason Your Mug Cake Overflowed - Tasting Table
Briefly

Baking microwave mug cakes demands precision; overfilling can cause batter overflow, leading to a mess. Use a larger mug and fill it only halfway to prevent this. If your cake still overflows, check the leavening agent used, as too much can cause excessive rising. Keep an eye on the cooking process since microwave strengths vary, and checking early can avoid overcooking. Adhering to ingredient measurement is crucial, highlighting that attention to detail is essential in baking, even for quick recipes.
A hard truth about baking is that all recipes require care and precision, even if your dessert is as tiny as a coffee mug and can be microwaved in seconds.
A good rule of thumb is to use a large cup and fill it halfway, if that much. A roomier choice could save you a lot of scrubbing.
Microwaves vary a lot in functionality, so it's better to monitor your treat instead of setting and forgetting it.
Always follow the right ways to measure baking ingredients, no matter if you're making a mug cake or a triple layer genoise.
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