Cut the chicken breast into bite-sized cubes and place them in a bowl.
Toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and cook for 5-6 minutes, turning occasionally, until golden and crispy.
Add the broccoli florets, sliced bell peppers, and pineapple chunks to the skillet, sautéing for another 3-4 minutes until the vegetables are tender-crisp.
In a small jar, whisk together the honey, rice vinegar, tomato paste, and tamari to create the sauce.
Pour the sauce over the chicken and vegetables, stirring constantly for 1 minute until the glaze thickens and coats everything beautifully.
Serve the stir-fry over the warm cooked brown rice and garnish with sesame seeds.