Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine the diced cooked chicken, frozen mixed vegetables, cream of chicken soup, garlic powder, onion powder, salt, pepper, and chicken broth. Stir thoroughly until evenly mixed.

In another bowl, whisk together the all-purpose flour, baking powder, and salt. Cut the cold, cubed butter into the dry ingredients until the mixture forms coarse crumbs.

Add shredded cheddar cheese and garlic powder to the crumb mixture, stirring to distribute, then gradually pour in the milk, mixing just until combined.

Drop spoonfuls of the biscuit dough over the chicken filling, ensuring an even distribution across the top.

Bake in your preheated oven for about 30 minutes until the biscuit topping turns golden brown and the filling is bubbly.

Let it cool for about 5-10 minutes before serving to allow the filling to set.