Step 1: Preheat the Oven : Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
Step 2: Prepare the Vegetables : Place the corn, red bell peppers (cut side down), onion, and unpeeled garlic cloves on the baking sheet. Drizzle with olive oil, season with salt and pepper, and toss lightly.
Step 3: Roast Until Charred and Tender : Roast for 25–30 minutes, turning once halfway through. The peppers should be slightly blistered, and the corn should be golden and aromatic.
Step 4: Steam and Peel the Peppers : Place the roasted peppers in a bowl and cover with plastic wrap for 10 minutes. This allows the skins to loosen. Peel off the skins and discard.
Step 5: Blend the Base : Squeeze the roasted garlic from its skin. In a blender or using an immersion blender, combine the roasted vegetables, smoked paprika, and 3 cups of the broth. Blend until smooth.
Step 6: Simmer and Season : Pour the blended soup into a pot and bring it to a gentle simmer. Add the remaining broth, butter, and cream (if using). Stir and cook for 10 minutes over low heat.
Step 7: Adjust the Flavor : Add lemon juice to brighten the flavors, then taste and adjust seasoning with salt, pepper, or more paprika as needed.
Step 8: Serve and Garnish : Ladle the soup into bowls. Garnish with a swirl of cream, roasted corn, herbs, and a light dusting of smoked paprika.