Add egg, milk, butter, and vanilla to mug. Mix well to combine.
Fold in remaining ingredients. Stir to combine.
Mug should be ½-¾ of the way full.
Place mug in microwave for 90 seconds - 2 minutes.
Remove mug from microwave and allow to cool for 2-3 minutes.
Top cake with banana slices, cinnamon, and walnuts.
Keyword banana bread, mug cake,
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