How To Make A Cookie In A Mug by How To Make A Cookie In A MugYou will need: a mug 1 Tablespoon unsalted butter 1 Tablespoon granulated sugar 1 Tablespoon brown sugar, firmly packed 1/2 teaspoon vanilla extract 1/8 teaspoon (pinch) salt 1 egg yolk 3 Tablespoons all-purpose flour 1-2 Tablespoons chocolate chipsFirstly melt you butterAdd in the suger, vanilla extract and saltMix in the egg yolkAdd the flour and fold in the chic chips Microwave for 40 secsVoila!! Dig in