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Very lightly coat the inside of a 6- or 8-ounce mug with butter or spray.
Add melted butter, egg yolk, granulated sugar, brown sugar, vanilla, and salt. Stir well.
Add flour and chocolate chips. Stir until just combined.
If crumbly, add a splash of milk until smooth.
Microwave 1 minute at 80% power (1000-watt microwave) or 45 seconds at 75% (1200-1500 watt).
Top should puff and spring back. Do not overcook.
Serve warm, directly in mug, with ice cream if desired.