Creating Roasted Celery and Potato Soup is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Prepare Vegetables: Wash and chop the celery, potatoes, and onion. Mince the garlic.
3. Roast the Celery: Spread the chopped celery on a baking sheet. Drizzle with olive oil, salt, and pepper. Roast for 20 minutes or until tender and slightly caramelized.
4. Sauté Onions and Garlic: In a large pot, heat a tablespoon of olive oil over medium heat. Add the chopped onion and sauté until translucent.
5. Add Garlic: Stir in the minced garlic and cook for an additional minute.
6. Add Potatoes and Broth: Add the diced potatoes to the pot along with the vegetable or chicken broth. Bring to a boil.
7. Simmer: Reduce heat and let it simmer for about 15 minutes or until the potatoes are fork-tender.
8. Blend the Soup: Stir in the roasted celery and use an immersion blender to puree the soup until creamy. Alternatively, transfer to a blender in batches to blend.
9. Add Cream and Season: Stir in the heavy cream, dried thyme, and adjust the seasoning with additional salt and pepper if needed. Heat through.
10. Garnish: Ladle the soup into bowls and garnish with fresh parsley.

These steps will guide you in creating this incredible soup effortlessly. Enjoy the delightful aroma filtering through your kitchen as the soup cooks!