Preheat oven to 400F if using raw turkey breasts.
If using raw turkey breasts, place them on a baking sheet and season with salt, pepper, poultry seasoning and a drizzle of EVOO. Roast them in the oven for about 45 minutes, or until a thermometer placed in the thickest part of the breast registers 165F. Loosely cover with foil to keep warm and reserve.
While the turkey is roasting, make the stuffing: Toast the bread slices then spread with the softened butter, about 1/2 tablespoon per slice. Chop into one-inch cubes and reserve.
Place a medium-size skillet over medium-high heat and add 1 tablespoon each of EVOO and butter. Add the chopped apple, onion, celery, and bay leaf, and season with salt and pepper. Cook until the onions begin to soften, about 5 minutes. Add the cubed bread and stir to combine. Chop the turkey meat and add to the stuffing. Moisten the stuffing with about 1/2 cup chicken stock, let the stuffing heat through and turn heat to low to keep warm.
To make the gravy, preheat a medium skillet over medium heat. Add 2 tablespoons butter and let it melt. Whisk in the flour and cook 1 minute. While whisking, add the apple cider along with 1 1/4 cups of stock. Season with salt and pepper. Cook gravy, stirring occasionally, until slightly thickened, about 3-4 minutes.
Divide the turkey/stuffing mixture among four plates and spoon the gravy over each. Garnish each plate with the chopped parsley.