Peel and chop the celery root into large pieces. Peel the onion and garlic.
Place the celery root, onion, and garlic on a baking sheet. Drizzle with olive oil, sprinkle with salt, pepper, and thyme. Roast at 400°F (200°C) for 25-30 minutes, or until the vegetables are golden brown and tender.
Transfer the roasted vegetables to a large pot, pour in the vegetable broth, and bring to a boil. Simmer for an additional 10 minutes to allow the flavors to meld.
Using an immersion blender or regular blender, blend the soup until smooth. Stir in the plant-based cream until well combined. Season with salt and pepper to taste.
Meanwhile, toast the bread croutons in a dry skillet until golden brown.
Serve the soup hot, garnished with toasted bread croutons and fresh thyme.
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