Roasting the vegetables in this blended soup enhances their natural sweetness, while white beans provide a creamy texture and a source of heart-healthy soluble fibre, known to help lower cholesterol levels.
Heat oven to 425 °F. On a large sheet pan, place tomatoes, pepper, celery, onion, and garlic with olive oil and thyme. Roast for 30–35 minutes until caramelized and tender.
Meanwhile, scrub and drain PEI mussels. Place them in saucepan with a splash of water, cover with a lid and steam over medium heat for about 7 minutes until the mussels have opened.
Discard any mussels that do not open. Remove from heat and allow to cool slightly. Once cool enough to handle, remove the rest from their shells and roughly chop. Stir the chopped mussels into the soup.
Transfer roasted vegetables and their juices to a blender with the white beans and 2 cups of broth. Blend until smooth and creamy, adding more broth if needed to reach a soup consistency. Pour into a large pot and bring a gentle simmer.