Remoulade Sauce: Combine mayonnaise, relish, tarragon, parsley, capers, mustard, lemon juice and pepper in bowl until blended. Cover and refrigerate until ready to use.
Preheat broiler. Grease a large baking sheet.
Fillets: Combine cornflake crumbs, chili powder, cumin, onion powder and pepper on large sheet of waxed paper. Brush each fillet with about 1 teaspoon mayonnaise per side. Dip fillets into crumb mixture, coating both sides. Spray both sides of each fillet with vegetable cooking spray. Place on prepared baking sheet. Broil 5 inches from source of heat, without turning, about 8 to 10 minutes or until fish just begins to flake and coating is golden. Serve with remoulade sauce. Garnish with parsley sprigs and lemon wedges.