Heat oil in a non-stick pan. Place the chicken in a bowl. Add soy sauce and mix. Set aside to marinate. Chop the spring onions and the greens.
Add the button chillies to the hot oil and deep fry for 1-2 minutes on medium. Drain the chillies and set aside.
Deep fry the peanuts on medium heat till golden brown. Drain and set aside. Add the chicken cubes to the hot oil and deep fry on medium heat till golden. Drain and set aside.
Heat another non-stick pan and add 2 tbsps of chilli oil remaining in the pan. Heat till the oil reaches smoking point.
Add garlic and fry till a little burnt. Add spring onions and chicken and toss.
Add sugar, salt and crushed Sichuan peppers and stir. Add peanuts and the button chillies and toss. Add spring onion greens and toss. Serve hot.