Begin by preheating your oven to 375°F (190°C). This ensures the casserole cooks evenly.
In a large mixing bowl, combine the shredded chicken, frozen peas and carrots, pre-cooked diced potatoes, finely diced onion, and minced garlic. Add the cream of chicken soup, chicken broth, dried thyme, freshly ground black pepper, and fine sea salt. Stir the mixture thoroughly until all ingredients are well incorporated and evenly coated.
Grease a 9x13 inch casserole dish with cooking spray or butter. Carefully pour the chicken mixture into the dish, spreading it evenly across the bottom to ensure even cooking.
Evenly sprinkle the shredded sharp cheddar cheese over the chicken mixture, allowing it to melt to create a deliciously cheesy topping.
Prepare the packaged biscuit dough by cutting each biscuit into quarters. Evenly scatter the biscuit pieces over the top of the casserole, ensuring all areas are covered for a nice, fluffy topping.
Place the casserole in the preheated oven and bake for 25-30 minutes. Keep an eye on it and remove it when the biscuits are golden brown and the filling is bubbling happily around the edges.
Once cooked, carefully remove the casserole from the oven and let it cool for 5-10 minutes. This resting time allows the filling to set slightly for easier serving.
Notes
Serve hot and garnish with freshly chopped parsley for added freshness.