1. Preheat oven to 150ºC .
2. In a medium bowl combine flour, soda, and salt. Mix well with wire whisk and set aside.
3. In a large bowl with an electric mixer, blend sugars at medium speed. Add butter and mix to form a grainy paste, scraping down the sides of the bowl. Add eggs and vanilla extract, and mix at medium speed until light and fluffy.
4. Add the flour mixture and chocolate chips, and blend at low speed until just mixed. Do not overmix.
5. Drop by rounded tablespoons onto an ungreased cookie sheet, 5 cm apart. Bake 22-24 minutes or until golden brown. Transfer cookies immediately to a cool surface with a spatula.
Taken from Mrs. Fields Cookie Book.