Lightly spray your slow cooker insert with nonstick cooking spray. Place the chicken breasts in the slow cooker. Sprinkle with salt and pepper. Pour the chicken broth over chicken. Top with 3 slices of cheese.
In a medium bowl, whisk together the soups and milk. Pour the mixture over the cheese. Place the remaining 3 slices of cheese on top of the soup mixture.
In a large bowl, combine the stuffing mix and the sausage; sprinkle it over the cheese. Drizzle the melted butter over the stuffing mixture.
Cover and cook on low 8 to 10 hours (or on high 4 to 6 hours).
Notes
Note that the nutritional info assumes that ALL of the sauce will be consumed. That's probably not going to happen, so the calorie count is likely to be less.