Add butter, brown sugar and granulated sugar in mixing bowl. Beat at medium speed until light and fluffy. Add egg and vanilla and mix on low speed until blended.

In a bowl add flour, baking soda and salt. Use whisk to mix. Add flour mixture to mixing bowl. Beat at low speed until well blended. Add chocolate chips.

Drop dough by 1/2 teaspoons 1 inch apart on cookie sheet lined with parchment paper or silicon mat. Bake at 350° for 7-9 minutes until bottoms are slightly golden.

Remove from oven and cool on cookie sheet for 2 minutes. Transfer cookies to wire rack to finish cooling.