Prepare the brown rice according to package directions and set aside.
In a small bowl, whisk together the fresh orange juice, orange zest, coconut aminos, grated ginger, minced garlic, and arrowroot powder until smooth to create the glaze.
Season the diced chicken breast evenly with the sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-7 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the pan and set aside; add the broccoli florets and sliced red bell pepper to the same pan with a tablespoon of water.
Cover and steam the vegetables for 3 minutes until they are bright green and crisp-tender.
Return the chicken to the pan and pour the orange sauce mixture over the top.
Stir constantly for 1-2 minutes until the sauce bubbles and thickens into a glossy glaze that coats the chicken and vegetables.
Serve the orange chicken and vegetables over the cooked brown rice and garnish with sesame seeds.