Preheat the oven to 375 degrees. Spray an 8x8 baking dish with non-stick spray.
Press the stuffing mixture into the bottom of the dish, covering it entirely.
Melt the butter in a large skillet over medium high heat. Add the peas, carrots and onions and cook for 5 minutes, or until softened. Add the garlic and cook 1 minute more.
Stir in the sage, rosemary, thyme, salt and pepper. Sprinkle the flour over the mixture and stir until the vegetables are coated.
Pour in the stock and stir frequently, until the mixture has thickened. Stir in the turkey until combined.
Pour the mixture over the stuffing and then top with mashed potatoes.
Bake for 45 minutes or until heated through.
Notes
Substitutions: 12 oz. bag frozen peas and carrots, 1 package prepared mashed potatoes or sweet potatoesRecipe ingredients can be doubled to fit into a 9x13 baking dish