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Put the butter and sugar in a microwave-safe cup or ramekin and microwave on high for 30-50 seconds (longer if using fridge-cold butter) until melted.
Stir in the egg yolk until glossy and combined. Stir in a pinch of salt and the vanilla. Add the flour, baking powder and chocolate chips. Microwave on high for 1 min until puffed and golden. Remove and leave for a few minutes before serving with ice cream, if you like.