01 - In a medium bowl, whisk together mayonnaise and sour cream until completely smooth and well blended.
02 - Stir in the minced jalapeños, jalapeño brine, garlic, cumin, onion powder, salt, and black pepper until thoroughly incorporated.
03 - Add the fresh lime juice and chopped cilantro, mixing well to distribute evenly throughout the sauce.
04 - Cover the bowl and refrigerate for at least 1 hour to allow the flavors to meld and develop fully.
05 - Remove from refrigerator, stir well before serving. Serve chilled as a dipping sauce for tortilla chips or drizzle over tacos and grilled meats.