Servings 1mug-full (1 large serving or 2 small servings to share)
1Tablespoonbrown sugarfirmly packed
Microwave butter in a mug until melted, 30 seconds to 1 minute. With a spoon, mix in sugars, vanilla extract and salt until well-combined. Mix in egg yolk until no traces of the yolk are seen. Mix in flour. Fold in chocolate chips.
Microwave on high for 40 seconds, or a maximum of 50 seconds. Serve warm (maybe even with a dollop of ice cream).
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