In a small bowl, melt butterscotch chips on ½ power in the microwave (I use 5 on my microwave). As soon as you remove it, quickly stir in shortening.
Immediately dip one side of each marshmallow into the melted butterscotch chips and place undipped side down on a piece of parchment or wax paper and sprinkle with nuts. Set aside.
Chop cantaloupe into cubes (or scoop into balls).
Thread a piece of cantaloupe through large wooden skewer, then a 2 bite brownie, then another piece of cantaloupe. Lastly, thread the marshmallow through, ensuring that the undipped side is down (touching the cataloupe) and the butterscotch nut side is up. Lay on a platter
Serve as soon as possible (as you do not want the cataloupe to sit very long - it will eventually make the brownies soggy.)