Preheat oven to 375 degrees. Lightly grease a large baking sheet or line with parchment paper. In a large bowl, mix together the butter, light brown sugar, egg and vanilla with an electric mixer until well combined.
In a small bowl, stir the flour and salt together and use an electric mixer again to add it to the dough. Fold in the 1/2 cup pecans and the chocolate chips.
Use a one inch cookie dough scoop to place dough balls on a cookie sheet, about two inches apart. Gently press a pecan half into the top of each cookie.
Bake 10-12 minutes, sprinkle with a little sugar when they are done.
If you like, while still warm, sprinkle the tops with a little white sugar.