Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with cooking spray or butter.
Season the chicken breasts with salt and pepper on both sides, then place them in the prepared baking dish.
In a mixing bowl, combine the shredded Swiss cheese, mayonnaise, sour cream, cream of chicken soup, and chicken broth. Mix well until smooth and creamy.
Pour the cheese mixture evenly over the chicken breasts in the baking dish, covering them completely.
In a separate bowl, combine the seasoned bread crumbs with melted butter until well coated.
Sprinkle the buttered bread crumbs evenly over the top of the cheese mixture.
Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
After 30 minutes, remove the foil and continue baking for an additional 15-20 minutes, or until the chicken is cooked through and the top is golden brown and bubbly.
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