Preheat the oven to 350 degrees.
In a medium bowl combine the flour, baking soda, and salt. Set aside.
In a large bowl cream together the butter and brown sugar.
Add in the egg and vanilla and mix well to combine.
Add the flour mixture to the butter mixture and mix until well combined.
Using a small cookie scoop, scoop 1 tablespoon of dough, roll into a ball, then roll into the granulated sugar. Place on the baking sheet and flatten slightly. Place cookie dough balls 2 inches apart.
Bake for 10 minutes. Remove from the oven and cool on the baking sheet for 2-3 minutes before removing to a wire rack to cool completely.