Mix together the flour, salt and baking soda in a small bowl, set aside.
Cream the sugars and butter together until light and fluffy. Beat in the vanilla.
Add the eggs one at a time, beating each in thoroughly.
Slowly add the flour mixture, mixing in until combined completely.
When completely mixed, stir in the butterscotch chips by hand.
Drop by large tablespoonful onto an ungreased cookie sheet.
Bake for 10-12 minutes, or until the edges and bottoms of the cookies are browned. Remove and let cool on the sheets for 5 minutes, then transfer to a wire baking rack. Cool completely.
Notes
the better the quality of your butterscotch chips, the better the cookies will be!