Bring a large pot of salted water to a boil. Add your pasta and cook according to package directions until al dente. Drain and set aside.
In the same pot, pour in the chicken broth and heavy cream. Stir in garlic powder, onion powder, dried thyme, salt, and pepper. Heat gently over medium heat until the mixture starts to simmer and slightly thicken, about 5 minutes.
Add the shredded cooked chicken and frozen mixed vegetables to the cream sauce. Stir well to combine and warm the vegetables through.
Return the drained pasta to the pot with the sauce, chicken, and veggies. Mix thoroughly so everything is coated with the luscious sauce.
Transfer the pasta mixture to your baking dish. Sprinkle the shredded cheddar cheese evenly over the top.
Drop spoonfuls of biscuit dough over the cheese layer, spacing them out evenly. These will bake into fluffy dumpling-like morsels.
Place the baking dish in a preheated oven at 375°F (190°C) and bake for 20-25 minutes, or until the biscuit dough is golden and cooked through.
Remove the bake from the oven and let it cool slightly. Sprinkle fresh parsley on top before serving for a bright, fresh finish.