Whisk honey, tamari, sesame oil, rice vinegar, minced garlic, and grated ginger in a small bowl until well combined.
Season diced chicken breast with sea salt and black pepper.
Heat avocado oil in a large skillet or wok over medium-high heat.
Add chicken and cook until golden brown and cooked through, then remove from the pan and set aside.
Add broccoli florets, bell peppers, and sugar snap peas to the pan and stir-fry for 3-4 minutes until tender-crisp.
Return the cooked chicken to the pan and pour the prepared honey-sesame sauce over the mixture.
Toss everything continuously for 1-2 minutes until the sauce reduces into a thick, glossy glaze that coats the chicken and vegetables.
Serve immediately over cooked brown rice and garnish with toasted sesame seeds.