Slice the chicken breasts horizontally in half and open them out flat. Place between two layers of greaseproof paper and flatten to about 5mm thick with a meat mallet or rolling pin.
Put the chicken breast in a shallow bowl and season with the crumbled stock cube and pepper.
Scatter the finely chopped onion over the chicken and add the chilli (if using) and oil. Toss everything together and cover the dish with Clingfilm. Leave in a cool place to marinade for five minutes (or longer).
Grill (or barbeque) the chicken until juices run clear (slice if preferred) and serve in a baguette, thickly spread with Hot Mango Chutney.
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