Preheat your oven to 400°F (200°C). Spread the pumpkin chunks on a baking sheet, drizzle with olive oil, and toss to coat evenly.
Roast the pumpkin for about 30-35 minutes until they become tender, fragrant, and slightly caramelized around the edges. Remove from the oven and let cool slightly.
While the pumpkin roasts, warm a little vegetable broth and dissolve the miso paste in it, whisking until smooth. Set aside.
Place the roasted pumpkin into a blender. Add the minced garlic and pour in the warm miso-infused broth.
Blend until completely smooth and velvety, adding coconut milk if you want a creamier texture. Taste and season with salt and pepper as needed.
Pour the blended soup into a saucepan and gently reheat over medium-low heat until steaming, about 5 minutes. Stir occasionally to prevent sticking.
Serve the hot soup in bowls, garnished with a drizzle of coconut milk or toasted pumpkin seeds if desired. Enjoy the rich, umami-infused flavor with a smooth, comforting texture.