01 - Add the cilantro leaves, chopped green onions, seeded jalapeños (or Aji Amarillo), and garlic cloves to a blender or food processor.
02 - Pour in the mayonnaise, sour cream, fresh lime juice, and grated Parmesan cheese. Season with kosher salt, black pepper, and drizzle in the olive oil.
03 - Process on high speed until the mixture is completely smooth and achieves a vivid green color throughout.
04 - Taste the sauce and adjust the salt, lime juice, or pepper to your preference.
05 - Transfer to a serving bowl. Refrigerate for 30 minutes to allow the flavors to meld, or serve immediately.