01 - In a medium bowl, whisk together miso paste, soy sauce, ginger, rice vinegar, honey, sesame oil, and garlic until smooth and well combined.
02 - Add chicken pieces to the bowl with the marinade, tossing to coat thoroughly. Let sit for at least 10 minutes, or up to 1 hour for deeper flavor penetration.
03 - Heat neutral oil in a large skillet or wok over medium-high heat. Add marinated chicken, reserving excess liquid in the bowl. Cook until browned on all sides and cooked through, approximately 6–8 minutes.
04 - Push chicken to one side of the skillet. Add snap peas to the open space and stir-fry for 2–3 minutes until bright green and just tender-crisp.
05 - Pour reserved marinade into the skillet and cook for 1 minute, stirring continuously to coat chicken and snap peas evenly with the glaze.
06 - Sprinkle with toasted sesame seeds and sliced spring onions. Serve immediately over steamed rice if desired.