Pat the chicken breast dry with a paper towel and cut into bite-sized 1-inch cubes.
In a small bowl, toss the chicken cubes with the arrowroot powder, sea salt, and black pepper until evenly coated.
Steam the broccoli florets for 3-4 minutes until they are tender-crisp and bright green, then set aside.
In a small ramekin, whisk together the coconut aminos, honey, minced garlic, and grated fresh ginger to create the teriyaki base.
Heat a large non-stick skillet over medium-high heat and add the toasted sesame oil.
Add the chicken to the skillet in a single layer, searing for 3-4 minutes per side until golden brown and cooked through.
Reduce the heat to medium and pour the teriyaki sauce over the chicken, stirring constantly as the sauce bubbles and thickens into a glaze.
Add the steamed broccoli to the pan and toss for 1 minute to coat everything in the sauce.
Serve the crispy chicken and broccoli over the warm cooked brown rice and garnish with sesame seeds.