Combine 5-spice (or allspice), garlic and 2 tablespoons oil. Toss in the chicken and allow to marinate for as long as you’ve got. A few minutes is fine but for anything longer than an hour, keep it in the fridge.
Heat a little oil in a wok or large frying pan on a very high heat. Add snow peas and stir fry until bright green and just cooked but still very crunchy. Remove to a clean bowl.
Heat a little more oil in the wok and stir fry chicken until well browned and just cooked though. About 5-10 minutes.
Return snow peas to the pan to warm through. Remove from the heat and toss in the soy sauce.