Pre-heat your oven to 350 degrees. Line cookie sheets with parchment paper.
In a mixing bowl whisk the flour, salt and baking soda. Set aside.
In the bowl of a stand mixer fitted with a paddle attachment cream the butter and sugars ( white and light brown) until smooth and slightly fluffy. Add in the eggs to the sugar mixture, one at a time then combine the vanilla and peppermint extract taking care to correctly measure the peppermint extract- a little goes a long way.
Reduce the mixer speed to low and slowly add in the flour mixture and combine until just combined and any flour streaks are gone.
Using a cookie scoop, scoop out balls of cookie dough, roll into a ball shape and place on the prepared baking sheets 3-4 inch apart. Chill for 10 minutes.
Bake the cookies for 12 minutes. The cookies will appear slightly underbaked . Let the cookies rest onto baking sheet for 5 minutes. Remove the cookies to a wire rack and cool completely. About 15-20 minutes.