Whisk the tamari, honey, rice vinegar, minced ginger, and minced garlic in a small bowl to create the teriyaki glaze.
Cut the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and cook until golden brown and fully cooked through, approximately 5 to 7 minutes.
Remove the chicken from the pan and set it aside on a plate.
In the same skillet, add the broccoli florets, sliced red bell pepper, and snap peas, sautéing for 3 to 4 minutes until tender-crisp.
Return the chicken to the skillet and pour the prepared glaze over the meat and vegetables.
Toss everything together for 1 to 2 minutes until the sauce thickens and evenly coats the ingredients.
Serve the stir-fry immediately over the warm cooked brown rice.