Preheat oven to 350°F (180°C). Rinse the turkey inside and out and pat it dry with paper towels. Season generously with salt and pepper, inside and out.
Score the chestnuts with an 'X' on the flat side. Boil them for a few minutes, then peel while still warm. In a skillet, melt the butter and sauté the chopped onion, garlic, and chestnuts until softened.
Combine the chestnut mixture with the breadcrumbs and chopped fresh thyme. Moisten with a little chicken stock until the stuffing is just combined and holds its shape.
Stuff the turkey cavity with the chestnut mixture. Tie the legs together with kitchen twine to secure the stuffing.
Place the turkey in a large roasting pan. Drizzle with olive oil and arrange the chopped carrots and celery around the turkey.
Pour a little chicken stock into the bottom of the pan and cover with aluminum foil. Roast the turkey for 3 hours, basting with its own juices every 30 minutes.
Remove the foil for the last 30 minutes of cooking time and roast until golden brown and the internal temperature reaches 165°F (74°C). Let the turkey rest for 15 minutes before carving.
Carve the turkey and serve with the chestnut stuffing and roasted vegetables. Serve alongside fresh bread or mashed potatoes.
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