In a small bowl, combine mayonnaise, sour cream, jalapeño juice, ground cumin, garlic powder, salt, and chili powder. Mix well.
½ cup mayonnaise, ½ cup sour cream, 3 Tablespoons pickled jalapeno juice, 2 teaspoons ground cumin, 1 teaspoon garlic powder, ½ teaspoon salt, 1 teaspoon chili powder