Cut the chicken breast into 1-inch bite-sized pieces.
In a small bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
Whisk together the orange juice, coconut aminos, minced ginger, and minced garlic in a small ramekin.
Heat avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and cook for 5-6 minutes, stirring occasionally, until golden brown and cooked through.
Toss in the broccoli florets and sliced red bell pepper, sautéing for an additional 3-4 minutes until crisp-tender.
Pour the orange sauce mixture over the chicken and vegetables, stirring constantly for 1 minute as the glaze thickens.
Remove from heat and drizzle with toasted sesame oil.
Serve the stir-fry over the warm cooked brown rice and garnish with sliced green onions.