Preheat oven to 375 degrees F.
Sift together the flour, baking soda and salt. Set aside.
In another bowl, cream together the butter and sugars, beating until fluffy and light colored.
Add the eggs, one at a time, mixing until just combined.
Add the flour mixture, stirring until just incorporated.
Add the hot water, butterscotch chips and oats and nuts if using. Gently stir until just combined. Do not over-mix.
Drop by level tablespoon onto ungreased baking sheet. Bake 7-8 minutes for chewy cookies, 9-10 minutes for crispy cookies.
Remove from oven. Cool several minutes on the pan before removing the cookies to finish cooling on a cooling rack.