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In a large microwave-safe coffee mug combine the dry ingredients. Add the milk, oil and vanilla and stir to combine.
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Microwave on high power for 1 minute. Microwaves vary: If a fork stuck in comes out with soft crumbs rather than uncooked dough, you're all set (and so is the cake).
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Top with the whipped cream and garnish with a dash of cinnamon or some chocolate shavings.