Slice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
In a small bowl, whisk together the tamari, honey, grated ginger, minced garlic, and toasted sesame oil to create the teriyaki sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the broccoli, bell peppers, and snap peas, stir-frying for 3-4 minutes until tender-crisp.
Return the chicken to the pan and pour the teriyaki sauce over the mixture, tossing for 1 minute until the sauce thickens slightly and coats everything.
Serve the stir-fry over the cooked brown rice and garnish with sesame seeds.