Preheat the oven to 350F and line a baking sheet with parchment paper.
Combine flour and salt in a medium sized bowl and set aside.
Using a handheld mixer, beat the butter and both sugars in a large bowl until creamy.
Beat in the egg and vanilla extract until combined.
Sift in flour mixture and stir until just combined.
Scoop about a tablespoon of dough for each cookie and roll in balls, using your thumb or the back of a teaspoon, make an indentation in the center of each cookie.
Bake for 11 to 12 minutes and transfer to a wire cooling rack to cool completely.