1
In a large mug, mix together the flour, brown sugar, baking powder, and pumpkin pie spice.
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2
Stir in the milk, pumpkin purée, vegetable oil, and vanilla extract until smooth, ensuring to scrape the bottom of the mug to mix thoroughly.
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3
Microwave on high for 60-90 seconds, or until the cake is set but still slightly moist on top.
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