01 - Whisk mayonnaise and sour cream together in a medium bowl until completely smooth and uniform.
02 - Add minced jalapeños, jalapeño brine, garlic, cumin, onion powder, salt, and black pepper. Stir thoroughly to distribute all spices evenly.
03 - Pour in lime juice and fold in chopped cilantro. Mix well until all ingredients are fully incorporated.
04 - Cover bowl tightly with plastic wrap or lid. Refrigerate for minimum 1 hour to allow flavors to develop and meld together.
05 - Remove from refrigerator, stir well before serving. Serve cold as dipping sauce, taco topping, or salad dressing.