Preheat your oven to 400°F (200°C).
Chop the red peppers into large chunks.
Place them on a baking tray with peeled garlic cloves.
Drizzle some olive oil over everything.
Roast for 40 minutes until the peppers are slightly blackened.
In a large pot, heat olive oil over medium heat.
Sauté chopped potatoes, celery, and onion.
Cook until the veggies are soft, which will take about 5 minutes.
Add roasted red peppers, garlic, chicken or vegetable broth, and sun-dried tomatoes to the pot.
Bring everything to a simmer.
Reduce heat, cover, and let it cook until the potatoes are tender, about 15 minutes.
Carefully blend the soup in batches.
Keep the lid slightly open to release steam.
Blend until smooth.
Stir in sour cream and season with salt and pepper.
Serve hot with chopped cilantro sprinkled on top.