In a medium sized pan, on medium heat, melt butter.
Add in flour and stir
Add in milk and stir
Add in salt and stir
Add in 1 cup chicken broth
Allow to thicken just a bit.
Set pan aside.
Cook up stuffing box according to package directions
Place the 3 cups chicken in a 9 by 12 pan.
Pour pan of sauce on top
Spoon stuffing on top
Garnish with shredded cheese of choice (I used parmesan)
Bake at 375 degrees for 20 minutes