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