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In a microwave-safe mug or bowl, mash the banana with a fork.
Add the egg and mix until fully combined.
Stir in the sugar and vegetable oil.
Add the flour and mix well until you get a smooth batter.
Microwave on high for about 1 minute. Cooking time may vary slightly depending on your microwave.
Let it cool for a few seconds before enjoying.
Serving and storage tips:
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