Preheat the oven to 400°F (200°C).

Grease a 2-quart casserole dish.

In a large mixing bowl, combine the cooked chicken, frozen mixed vegetables, cream of chicken soup, and chicken broth.

Mix well.

Spread the chicken and vegetable mixture evenly in the greased casserole dish.

In a separate bowl, mix together the self-rising flour, melted margarine, and milk to form the topping mixture.

Pour the topping mixture over the chicken and vegetable mixture in the casserole dish, spreading it out evenly.

Bake in the preheated oven for 1 hour, or until the topping is golden brown and the filling is bubbly.

Let cool for a few minutes before serving.