Preheat oven to 375ºF (190ºC).
In the large bowl of a standing mixer, beat together butter, sugars, egg and vanilla extract until mixture is light and fluffy, about 4 minutes. Add flour, baking soda and salt, beating to combine. Stir in chocolate chips.
Drop dough by heaping tablespoonfuls onto ungreased (or parchment-lined) baking sheets. Bake in centre of oven for 8-10 minutes. If baking more than one sheet at a time, rotate halfway through cooking. Cool on wire racks.
Per World’s BEST Chocolate Chip Cookies
PER COOKIE: about 173 calories, 2 g protein, 10 g total fat (6 g sat.fat), 20 g carbohydrate, 1 g fibre, 24 mg cholesterol, 113 mg sodium.