In a medium bowl, whisk together flour, baking soda and salt. Set aside.
Beat together butter and brown sugar until light and fluffy, about 2 minutes. Add vanilla and egg. Mix well.
Add flour mixture gradually at low speed. Stop when flour is just combined. Stir in chocolate chips.
Bake for 9-11 minutes until they are just golden on the edges. Leave on baking sheet for 2 minutes before removing to a wire rack to cool. Store in an airtight container.
Notes
*Spoon flour into measuring cup and level with a knife instead of scooping from container. Too much flour and the dough will be too dry and crumbly.
Recipe by Crumbs and Chaos at http://www.crumbsandchaos.dreamhosters.com/2015/09/best-brown-sugar-chocolate-chip-cookies/