Preheat the oven to 375°F.
Line two baking sheets with parchment paper.
In a medium bowl, measure the butter, brown sugar and white sugar. Cream and combine until smooth.
Crack the egg into a small bowl, add the vanilla and whisk to mix together. Add it into the bowl with butter and sugars. Stir to combine.
Add the flour mixture to the wet ingredients in three additions. Mix until almost blended.
Stir in the chocolate chips. Mix until combined.
Scoop out spoonfuls of dough and shape them into a ball (a little larger than a golf ball).
Place onto a parchment lined baking sheet. Space cookies so they are three finger widths apart from each other.
Bake for 12 to 15 minutes or until golden brown.
Let cool on the baking sheet for 5 minutes then transfer onto a wire rack to cool completely.