Preheat the oven to 375 degrees F.
Beat butter, egg and vanilla in a large bowl until mixed together.
In a separate bowl, combine flour, baking soda, salt, and sugars. Stir to mix well.
Add dry mixture to wet and mix well.
Place a rounded tablespoon onto a baking sheet.
Bake for 9-11 minutes or until golden brown.
Place on a wire rack to cool.