Slice the chicken into thin cutlets. Season with salt and pepper to taste. Coat generously with piri-piri sauce and let it marinate for 15 minutes.
Heat the olive oil in a skillet over medium heat. Cook the chicken cutlets until golden brown and cooked through, about 4-5 minutes per side.
Toast the cut sides of the burger buns until lightly golden and crispy.
Thinly slice the tomatoes and red onion. Prepare the iceberg lettuce leaves.
Assemble the burgers: Place a layer of iceberg lettuce on the bottom bun. Top with the cooked chicken cutlet, followed by slices of tomato and red onion. Add a spoonful of mayonnaise, and cover with the top bun.
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