Mix the sauce ingredients in a small bowl, set aside until needed.
Put the chicken in a bowl and add the cornflour. Season with salt and pepper and toss to coat thoroughly.
In a large frying pan, add a splash of oil and bring to a high heat. Add the chicken and fry until golden, turn and repeat.
Remove the chicken from the pan and place on a plate, keep warm.
Add the spring onions and peppers and stir fry for 4 minutes. Add the cashews and cook for another few minutes.
Add the chicken back into the pan and warm through. Add the sauce and stir to coat the chicken and vegetables. Cook the sauce for a couple of minutes until glossy and sticky.
Add the basil and sesame seeds, mix to combine. Top with the chilli and serve with noodles or rice.