Preheat the oven to 350 degrees F.
Bring the stock up to a boil. Add the rice, Craisins and any salt and pepper as needed, especially if using unsalted stock.
Place the lid on the pot and turn the heat down to a gentle simmer. Cook for 15 minutes, or until all the liquid is absorbed. Remove from the heat and allow to sit for 5 minutes. Scrape the rice into a large mixing bowl and set aside.
While the rice is cooking, cut the peppers in half from the top to the bottom. Remove any membranes, seeds, and the thick, white part of the core and discard.
Place the peppers in a bowl with about an inch of water, layering them on top of each other is fine. Microwave them for about 8 minutes on high, or until just softened. (If your microwave is large enough to hold your 9x13” dish, you can place the peppers cut-side up in the dish with about a cup of water and microwave them to soften. Pour out the water before filling; you may have to remove the peppers to drain, then return them to the dish.) If you microwaved the peppers in a bowl, once softened, place them cut-side up in the baking dish. Set aside.
While the rice is cooking, brown the ground turkey in a medium skillet (nonstick works well) until cooked completely through. Drain and set aside while you prepare the remaining ingredients.
In the same skillet, heat 1 tablespoon of oil over medium-high heat. Add the sweet potatoes, leeks, and celery. Cook, stirring often, until the sweet potato is just tender, approximately 5 to 7 minutes. (Some caramelization is fine and good.)
Add the shallot and stir often until just softening, about 2 minutes. Add the garlic and stir for about 20 seconds. Turn the heat off and add the Worcestershire sauce, poultry seasoning, garlic and onion powders, thyme, pecans, 2 tablespoons parsley, and the drained turkey.
Toss all the ingredients together. If you’d like more moisture in the filling, add ¼ cup of the stock. Stir, and add more stock if preferred. Since the turkey has been fully cooked, it is safe to taste the mixture for seasoning and adjust as desired.
Place the peppers, cut-side up in the baking dish. Evenly divide and mound the turkey-rice mixture into the peppers. Top each pepper with cheese.
Bake in the preheated oven for 30 minutes, or until the filling is lightly bubbling and the cheese has melted.
Remove from the oven and sprinkle with the remaining 2 tablespoons parsley before serving.
Serve very warm.