Cream together the butter, oil, sugars, egg and vanilla. Add salt, baking soda, flour and mix until just incorporated. Add oats, coconut, crushed cornflakes and butterscotch chips and mix on low, just until combined.
Bake for 12-14 minutes or until edges are golden brown. Remove from oven and let cookies sit on baking sheets for about 3 to 4 minutes then transfer to a wire rack.