Split the squash in half, and scoop the seeds out
Place the 2 halves of squash with open cavities facing up, into a shallow baking dish
Add one tablespoon of brown sugar and one tablespoon of butter into each cavity of the squash.
Pour a little bit of the chicken broth into the cavities of the squash (amount will vary depending on the size of your squash, but 2-3 Tbsp. in each cavity should do the trick)
Add the rest of the broth to the bottom of the baking dish
Cover with foil, and bake at 400 degrees, for about 40 minutes, or until squash is fork-tender.
Remove from oven, transfer the squash to a work surface to scoop out the cooked flesh, removing it from the outer skin
Place the cooked squash into a large bowl
Add the juices (broth) from the baking dish
Mash the squash incorporating the broth in the pan with the squash
Add the salt and mix in
Sprinkle 1/2 up to 1 tsp. of cinnamon over the butternut squash. Only 1/2 if you want only a hint of cinnamon in the dish, up to 1 tsp.