Preheat the oven to 375°F. In a large skillet, stir together the cream of chicken soup, milk, garlic powder, rosemary, salt, and pepper. Heat over medium until the mixture is smooth and warmed through.
Add the shredded chicken and frozen mixed vegetables to the skillet. Stir and cook for 5 minutes until everything is heated evenly.
Pour the mixture into a baking dish and spread it into an even layer.
Arrange the biscuit dough pieces on top of the filling, spacing them slightly apart.
Bake for 20 to 25 minutes until the biscuits are golden and the filling is bubbling around the edges.