Preheat the oven to 375°F (190°C).
Lightly grease a 9x13-inch baking dish.
In a large bowl, whisk together the cream of mushroom soup, sour cream, chicken broth, garlic powder, onion powder, salt, and black pepper.
Stir in the frozen mixed vegetables.
Arrange the frozen dumplings evenly in the prepared baking dish.
Pour the sauce mixture over the dumplings, ensuring they are mostly covered.
Sprinkle the shredded cheddar cheese evenly over the top.
Cover the dish tightly with aluminum foil.
Bake for 30 minutes.
Remove the foil and bake for an additional 15–20 minutes, until bubbly and lightly golden.
Let rest for 5 minutes before serving.
Garnish with chopped parsley if desired.