01 - Set oven temperature to 425°F.
02 - Cut red bell peppers in half, removing seeds and stems; halve tomatoes; chop onion; peel garlic.
03 - Place peppers cut side down, tomatoes cut side up, onion, and garlic on a baking sheet; drizzle with 1 tablespoon olive oil and season lightly with salt and pepper.
04 - Roast in preheated oven for 25 to 30 minutes until peppers are charred and vegetables soften.
05 - Remove from oven, allow peppers to cool slightly, then peel off and discard skins.
06 - Heat remaining 1 tablespoon olive oil over medium heat in a large pot; add roasted vegetables, dried basil, thyme, and crushed red pepper flakes; stir for 2 minutes.
07 - Pour vegetable broth into the pot, bring to a simmer, and cook for 10 minutes.
08 - Puree soup using an immersion blender or transfer in batches to a countertop blender until smooth.
09 - Stir in heavy cream, adjust seasoning with salt and pepper to taste.
10 - Heat gently for 2 minutes, then serve hot.