Cut the chicken breast into bite-sized cubes and place them in a small bowl.
Toss the chicken with arrowroot powder, sea salt, and black pepper until each piece is lightly and evenly coated.
Heat the sesame oil in a large non-stick skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the skillet in a single layer and sear for 3-4 minutes per side until golden brown and crispy, then remove the chicken from the pan and set aside.
In the same skillet, add the broccoli florets, sliced red bell pepper, and snap peas, sautéing for 4-5 minutes until tender-crisp.
Add the minced fresh ginger and garlic to the vegetables and cook for 60 seconds until highly fragrant.
Return the cooked chicken to the skillet and pour in the coconut aminos and rice vinegar.
Toss all ingredients together for 1-2 minutes until the sauce thickens slightly and coats everything beautifully.
Serve the stir-fry over the warm cooked brown rice and garnish with sesame seeds and thinly sliced green onion.