Cut the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, arrowroot powder, and red pepper flakes until smooth.
Heat the sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through, then transfer to a plate.
In the same skillet, add the broccoli florets, sliced bell pepper, minced garlic, and grated ginger with a splash of water.
Cover and steam-fry the vegetables for 3-4 minutes until they are tender-crisp and bright green.
Return the chicken to the skillet and pour the prepared sauce over the mixture, stirring constantly for 1 minute until the glaze thickens and coats everything.
Serve the stir-fry over the warm brown rice and garnish with a sprinkle of sesame seeds.