Slow cooker method: Make sure that you chop all of the vegetables in similar size pieces to ensure even cooking. Combine all of the ingredients into the slow cooker, give it all a good stir. Set it on LOW and let it cook for 4-5 hours.
Stovetop method: Chop all of the vegetables in similar sizes to ensure even cooking. Preheat a large soup pot over medium heat. Add a drizzle of olive oil to the bottom of the pot, and add the onion, garlic, and butternut squash. Stir frequently, let it cook for 2-3 minutes until the onion starts to become translucent. Next, add in all of the rest of the ingredients and stir. Turn the heat down to medium-low and cover with a lid. Bring it to a gentle simmer and let it simmer for 40-45 minutes.
Once done cooking, spoon it into bowls, and top with whatever you want. I love to add sour cream and fresh parsley.