Cut the avocados in half, remove the pit, and scoop the flesh into a blender.

Add sour cream, lime juice, minced garlic, salt, and black pepper to the blender.

Blend until smooth and creamy, scraping down the sides as necessary.

Taste and adjust seasoning if needed. If using, add chopped cilantro and blend briefly to combine.

Transfer the sauce to a serving bowl and serve immediately or refrigerate until ready to use.