In medium bowl, whisk mayonnaise, sour cream, lime zest, lime juice and cilantro.
In large bowl, combine salt, pepper, 3/4 cup breadcrumbs, salmon, chiles, scallions and 3 tablespoons mayonnaise mixture. Form salmon mixture into four patties. Cover patties with remaining breadcrumbs.
In skillet, heat oil. Add breaded patties and cook until golden brown, about 3 minutes on each side.
Serve with remaining mayonnaise mixture.