Preheat a deep non stick pan on a medium heat. Spray it with oil spray. Add the pre chopped chicken, chopped peppers and finely chopped leek. Fry it for 5-7 minutes, until the chicken will brown slightly.
Add to the pan: cola, chicken stock, passata and a tomato puree, Worcestershire sauce, soy sauce and herbs and mix well. Bring it to boil, lower the temperature, cover and cook for 12-15 minutes.
If you want to use it, add now the sugar snap peas. Cook for another 15 minutes, until the chicken is cooked and the vegetables are soft. In this time the sauce will thicken.
Serve it with a favourite rice, for example basmati or brown rice.