01 - Whisk mayonnaise and sour cream in a medium bowl until completely smooth and uniform.
02 - Add minced jalapeños, jalapeño brine, garlic, cumin, onion powder, salt, and black pepper. Mix thoroughly to distribute evenly.
03 - Stir in fresh lime juice and chopped cilantro until fully incorporated.
04 - Cover bowl and refrigerate for minimum 1 hour to allow flavors to develop and meld together.
05 - Stir sauce before serving. Serve chilled as a dip for tortilla chips or drizzle over tacos and grilled meats.