reheat the oven to 400°F. Line a rimmed baking sheet with foil, then lightly the foil or spray with nonstick baking spray. Spread the tomatoes, onions, garlic, and jalapenos on the baking sheet. Roast in the oven until softened and well browned in spots, about 20 to 25 minutes.
Transfer the vegetables to a blender or food processor and add the chipotle sauce and cilantro. Add the tablespoon of olive oil. Pulse, then puree until the desired consistency is reached. Add salt and pepper to taste.