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Place the butter in an 8-ounce microwave-safe mug, and microwave for 30 seconds until mostly melted.
Stir in the sugar, vanilla, and salt with a spoon until combined.
Add the egg yolk and stir until smooth.
Stir in the flour and most of the chocolate chips until combined.
Sprinkle the top with the remaining chocolate chips.
Microwave on high for 45 seconds to 1 minute or until the dough has puffed and appears dry.
Let cool for a few minutes before serving. Best is enjoyed warm with ice cream.