1. In a bowl, mix flour, baking powder, sugar and salt.
2. Add milk, melted butter, egg, vanilla extract and stir until combined and smooth.
3. Transfer the batter into 2 microwave safe mugs, fill only 2/3, place the mug (one at the time) in the center and cook for 60-70 seconds, or until it has stopped rising and is firm to the touch.
4. Serve immediately and dust with powdered sugar.
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