In a small bowl, whisk together the orange juice, tamari, honey, minced ginger, and minced garlic until well combined.
Pat the chicken breast dry and cut into bite-sized pieces, then toss in a bowl 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 sauté for 5-6 minutes until golden brown and cooked through.
Add the broccoli florets and sliced red bell pepper to the skillet, stir-frying for another 3-4 minutes until the vegetables are tender-crisp.
Pour the orange sauce mixture over the chicken and vegetables, tossing constantly for 1-2 minutes until the sauce thickens into a glossy glaze.
Remove from heat and garnish with sliced green onion and sesame seeds before serving.