Preheat the oven to 400°F (205°C).
On a parchment-lined sheet pan, place the tomatoes, onion wedges, garlic cloves, carrots, and red bell pepper pieces. Drizzle generously with olive oil and season with salt and black pepper. Roast the vegetables for about 35-45 minutes, until they are fork-tender.
If you have an immersion blender, transfer the roasted vegetables to a pot. Add vegetable broth, coconut milk, chopped basil, tomato paste, red pepper flakes, and Italian seasoning. Use the immersion blender to blend everything together until smooth. If you don't have an immersion blender, add all the roasted vegetables, vegetable broth, coconut milk, chopped basil, tomato paste, red pepper flakes, and Italian seasoning to a regular blender. Blend until the mixture is smooth. Transfer the blended mixture to a pot.
Heat the soup over medium-low heat until warmed through. Drizzle with olive oil, oat or coconut cream/milk, and balsamic glaze. Garnish with red chili pepper flakes and fresh basil leaves. Enjoy with your favorite grilled cheese sandwich!