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Export 6 ingredients for grocery delivery
Add flour, sugar, baking powder, and salt to a mug and stir together.
Stir in milk, melted butter, and vanilla extract until smooth, being sure to scrape the bottom of the mug. Stir in sprinkles.
Cook in microwave for 70-90 seconds* (until cake is just set, but still barely shiny on top). Allow to rest in microwave for 1 minute before consuming.