Cream butter and brown sugar in a large bowl. Beat in egg.
Stir together flour, cinnamon, salt, and soda in a small bowl.
Add to the creamed mixture with the apples, butterscotch chips, and nuts. Stir till well combined. Dough will be very stiff at first, but as the apples release juice, it will moisten right up.
Drop dough by spoonfuls onto silpat lined or lightly greased cookie sheets. Bake at 350° for about 12-14 minutes, or till light brown around the edges.
Let sit on the pan for 3-5 minutes before removing to cooling racks.