Gather all ingredients on a clean surface.
Rinse the cilantro under cold water and pat dry.
In a blender, combine the chopped cilantro, Greek yogurt (or sour cream), and lime juice.
Add minced garlic, salt, and pepper to the blender.
If desired, add honey or agave syrup for sweetness.
Blend the mixture until smooth and creamy.
While blending, slowly drizzle in the olive oil until fully incorporated.
Taste the dressing and adjust seasoning if necessary.
Transfer the dressing to a jar or airtight container.
Refrigerate for at least 30 minutes to let flavors meld before serving.