Preheat oven to 400°F (200°C) and grease a 9x13-inch baking dish.
In a large bowl, combine chicken, vegetables, soup, milk, cheese, and seasonings.
Pour the mixture into the prepared baking dish and spread evenly.
Cut biscuits or puff pastry into pieces and arrange on top of the filling.
Brush the top with melted butter.
Bake for 25–30 minutes, or until the top is golden and the filling is bubbly.
Let cool for 5–10 minutes before serving.