Preheat oven 375°F, on a sheet pan arrange peppers, onions, garlic, and sprinkle salt and EVOO. Roast for 30 mins, flip at 20 mins. Remove peppers and place in bowl and cover for 20 mins, until skins remove easily. Remove pepper skins, seeds, ribs and discard. Place pan juices, Onions, Garlic, Sour Cream, Cilantro and blend in your food processor or blender until smooth.