1.Preheat an oven-grill to high. Split bread; grill both sides for 1 minute or until golden. Transfer to serving plates.
2.Press chicken into seasoning to coat evenly. Heat oil in a heavy-based frying pan over moderately high heat. Add chicken; cook for 3 minutes each side or until golden and cooked. Transfer to paper towels.
3.To assemble: spread mayonnaise over cut sides of bread, top bases with chicken, avocado, tomato, onion and salsa. Top with remaining bread. Serve with salad.
Use any type of bread or bread roll for the sandwich. Chicken breast sizzle steaks are also sold as uncrumbed schnitzels. Mexican crispy chicken seasoning is available in the international aisle.