Preheat oven to 375 degrees Fahrenheit.
In a large bowl cream together the butter and the sugar.
Mix in one egg at a time.
Add vanilla extract and mix well.
In a separate bowl, mix together the flour, salt and baking soda.
Add the dry ingredients to the wet ingredients gradually, a little at a time. Mix well.
Flour your hands to prevent the dough from sticking and spread on prepared jelly roll pan.
Bake for 12-15 minutes. Do not overbake or you'll end up with dry bars!