In a microwave-safe mug, crush the Oreo cookies with a fork until they are fine crumbs.
Add the milk, flour, sugar, baking powder, and salt to the mug and stir until just combined.
Stir in the vegetable oil and vanilla extract.
Microwave the mug on high power for 1 minute and 30 seconds, or until the cake is set.
Let the cake cool for a minute or two before serving.
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Notes
TipsFor a richer flavor, use double-stuffed Oreos.If you don't have milk, you can use water or coffee instead.For a more decadent treat, top the mug cake with whipped cream, ice cream, or chocolate sauce.You can also experiment with different flavors by adding in other ingredients, such as chocolate chips, peanut butter, or sprinkles.Variations:Double Chocolate Oreo Mug Cake: Add 1 tablespoon of cocoa powder to the batter.Peanut Butter Oreo Mug Cake: Add 1 tablespoon of peanut butter to the batter.Mint Oreo Mug Cake: Add 1/4 teaspoon of peppermint extract to the batter.Salted Caramel Oreo Mug Cake: Top the mug cake with a drizzle of salted caramel sauce.