Preheat oven to 375°F (190°C).
- In a large bowl, mix together shredded chicken, frozen vegetables, cream of chicken soup, chicken broth, salt, pepper, and optional herbs.
- Pour the chicken mixture into a greased 9×13-inch baking dish and spread evenly.
- In a separate bowl, prepare the Red Lobster biscuit mix according to package directions by combining the mix with milk and optional shredded cheese. Do not include the herb butter packet yet.
- Spoon or spread the biscuit batter evenly over the chicken mixture without stirring.
- Bake uncovered for 35–40 minutes, or until the biscuit topping is golden brown and cooked through.
- In a small bowl, melt the butter and stir in the contents of the herb seasoning packet. Brush this mixture over the biscuit topping immediately after baking.
- Let the casserole rest for 5–10 minutes before serving.