Place sour cream, chopped cilantro, chopped jalapeño, lime juice, salt, dried dill, dried parsley, onion powder, and garlic powder in a food processor or blender.
Blend until smooth and creamy, about 30 seconds. If it's too thick, add a splash or two of buttermilk to reach your desired consistency.
Taste and adjust seasonings if needed, then serve immediately or chill for extra flavor.