Preheat oven to 350 degrees F. Place pecans on a cookie sheet and toasted for 8 minutes or until aromatic. Set aside to cool, then chop.
Stir together the flour, baking soda and salt. Set aside. In a large bowl, cream together the butter, brown sugar, and white sugar. Beat in the instant pudding mix until blended. Stir in the eggs and vanilla. Blend in the flour mixture. Stir in butterscotch morsels and chopped pecans. Drop cookies by rounded spoonfuls onto ungreased cookie sheets.