Deep Dish Chocolate Chip Cookie ( For those days you just want to make one cookie)

1 tbsp. butter,melted
1 tbsp. white sugar
1 tbsp. brown sugar
3 drops of vanilla
pinch of salt
1 egg yolk
1/4 c. flour
2 tbsp. chocolate chips 

Mix all ingredients and microwave 40-60 secs in a cup or bowl
                               {single serving}