01 - Place cilantro leaves, green onions, chili peppers, and garlic cloves into a blender or food processor bowl.
02 - Pour in the lime juice, mayonnaise, sour cream, Parmesan cheese, olive oil, white vinegar, kosher salt, and black pepper with the aromatics.
03 - Process on high speed until the mixture reaches a smooth, creamy consistency, pausing to scrape down the sides of the bowl as needed.
04 - Taste the sauce and adjust the salt, pepper, or chili heat level to your preference.
05 - Transfer the sauce to a serving bowl and refrigerate for at least 30 minutes to allow the flavors to meld together before serving.