Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper. Spread the pumpkin flesh evenly on the sheet, drizzle with olive oil, and roast until tender and edges are slightly caramelized, about 30-35 minutes.
Meanwhile, in a large pot, sauté the finely chopped onion and minced garlic in a splash of olive oil over medium heat until fragrant and translucent, about 5 minutes.
Add the ground cinnamon and red chili flakes to the onion mixture, stirring well to release their aromas, about 1 minute.
Once the pumpkin is roasted and cool enough to handle, scoop the flesh into the pot with the sautéed aromatics, stirring gently to combine.
Pour in the vegetable broth and bring the mixture to a gentle simmer. Let it simmer uncovered for about 10 minutes, allowing the flavors to meld.
Transfer the soup carefully into a blender and blend until completely smooth and velvety, stopping to scrape down the sides as needed. Be cautious of hot splashes.
Return the blended soup to the pot and stir in the coconut milk, creating a creamy and rich consistency. Season with salt and pepper to taste.
Bring the soup back to a gentle heat, warming through for another 5 minutes. Taste and adjust the seasoning if needed, adding more chili flakes for extra heat.
Serve the hot soup in bowls, garnished with a sprinkle of chili flakes or a dash of cinnamon for added flair and aroma.
