Preheat oven to 400F. Peel and chop the butternut squash into 1 inch cubes. Place onto a baking sheet and drizzle with the 2 tablespoons of olive oil. Season with salt and pepper and roast in the oven for approximately 35 minutes or until the squash is fork tender. Be sure to check on the squash after 20 minutes of cooking and flip the cubes.
Meanwhile, heat the remaining tablespoon of olive oil in a large pot. Add the carrots and celery and saute for 3 minutes. Add the onion and continue to cook until the vegetables are soft and the onion is translucent. Season with salt and pepper. Add the sage and thyme in the last minute of cooking.
Once squash is roasted, add it to the pot and add 2 cups of vegetable broth. Simmer for 10 minutes and then remove from heat and let it cool.
Once cooled enough so that it is safe to blend, add the soup to a food processor or blender. You may need to do this in batches. Puree the ingredients until smooth. If needed, add the remaining cup of vegetable broth to reach the desired consistency.
Transfer back into the large pot and heat through. Taste and adjust seasoning as needed.
Note: Metric ingredient measurements are provided as a courtesy using a third-party calculator and are rounded to the nearest unit. The recipes provided on this site have not been tested with metric measurements and their accuracy cannot be verified.
The nutritional information provided is based on third-party calculations and is an estimate only. Accurate nutritional facts will vary based on the particular brands used, portion sizes, measurement accuracy and more.