Mix the butter, 1.5 cups of sugar and salt in a bowl. Slowly add the egg and the vanilla, mixing thoroughly.
Add the flour, baking soda and baking powder and mix until smooth.
Fill a small bowl with the remaining brown sugar. Take golf ball sized scoops of the dough, and with your hands form them into a sphere.
Coat the dough balls with a generous amount of brown sugar, then place on a lined baking sheet.
Put the cookies in the oven and bake until the tops are cracked and the edges are caramel colored (about 10-12 minutes). For best results rotate the cookies half way through baking. Cool and enjoy!
Recipe by Ahu Eats at https://www.ahueats.com/2013/11/recipe-caramelized-brown-sugar-cookies.html