Baking 101: Cookie in a Mug

Ingredients:
1 tbsp butter, melted
1 tbsp white sugar
1 tbsp brown sugar
3 drops of vanilla
pinch of salt
1 egg yolk
1/4 cup flour
2 tbsp chocolate chips (we used Hershey's chocolate bar)

The instruction was not provided, so we just mixed all the ingredients in a mug. Microwave for 1 1/2 minutes or until the cookie looks convincing enough for you :p