01 - Preheat oven to 425°F.
02 - Halve red bell peppers, remove seeds and membranes, and place cut side down on a parchment-lined baking sheet.
03 - Roast peppers for 20 to 25 minutes until skins are blistered and charred. Transfer to a bowl, cover with plastic wrap, and let steam for 10 minutes. Peel skins off and chop the flesh.
04 - Heat olive oil in a large pot over medium heat. Add onion, carrot, and celery; sauté for 5 to 7 minutes until softened.
05 - Add minced garlic, smoked paprika, ground cumin, and chili flakes; cook for 1 minute until aromatic.
06 - Stir in chopped roasted peppers and rinsed lentils, then pour in vegetable broth.
07 - Bring to a boil, reduce heat, and simmer uncovered for 20 to 25 minutes until lentils are tender.
08 - Use an immersion blender or countertop blender to purée soup until smooth, or leave slightly chunky if preferred.
09 - Season with salt and black pepper to taste. Serve hot with chopped fresh parsley and lemon wedges.