Prep ingredients per the instructions above.
Preheat the oven to 350°F (176°C).
Place the cucumber rounds into the water and let infuse in the refrigerator until service.
Heat a pot over medium heat. Once hot, add the oil followed by the carrots, celery, onion, and garlic. Sauté until the celery begins to soften.
Add the chicken broth, chicken, thyme, salt, and pepper, and bring to a simmer for about 25 minutes, covered with a vented lid.
Add the noodles to the pot and cook with the lid on until tender; refer to the directions on the package for cooking time.
Place baguette slices in the oven for a few minutes, until hot.
To finish the soup: Taste the soup and adjust the seasoning with salt and pepper. Remove the thyme sprigs.
To serve: Ladle soup into a bowl. Serve with a side of bread and a glass of cucumber water.