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