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Export 6 ingredients for grocery delivery
Step 1
Add flour, sugar, baking powder, and salt to a mug and stir together.
Step 2
Stir in milk, melted butter, and vanilla extract until smooth, being sure to scrape the bottom of the mug. Stir in sprinkles.
Step 3
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.