Fry the chicken breast strips well in oil, then set aside. Fry the curry paste in the oil over low heat, then add coconut milk, stir and bring to the boil briefly. Add the broccoli, mushrooms and chicken breast, stir in the fish sauce and palm sugar. Cook for 5 minutes over medium heat, then add the peach slices and simmer for a while, but do not let the vegetables get too soft.