- Preheat your oven to 425°F (220°C). 
- In a large bowl, combine the chopped carrots, potatoes, bell peppers, onions, zucchini, and minced garlic. 
- Drizzle the olive oil over the vegetables and sprinkle with thyme, basil, salt, and pepper. Toss until the vegetables are evenly coated. 
- Spread the vegetables in a single layer on a baking sheet. Roast in the preheated oven for 25-30 minutes, or until the vegetables are tender and slightly caramelized. 
- In a large pot, combine the roasted vegetables and vegetable broth. Bring to a boil over medium-high heat, then reduce the heat and let it simmer for 10 minutes. 
- Use an immersion blender to puree the soup until smooth. If you don’t have an immersion blender, carefully transfer the soup in batches to a countertop blender. 
- Stir in the lemon juice and adjust seasoning if necessary. 
- Serve hot, garnished with fresh parsley if desired.