Whisk together the fresh orange juice, tamari, honey, rice vinegar, minced ginger, minced garlic, and arrowroot powder in a small bowl until smooth.
Season the diced chicken breast evenly with 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 sear until golden brown and cooked through, approximately 5 to 6 minutes.
Remove the chicken from the pan and set aside, then add the broccoli florets and sliced bell peppers with a small splash of water.
Cover the pan and steam the vegetables for 3 minutes until they are tender-crisp and vibrant green.
Return the cooked chicken to the pan and pour the orange sauce mixture over the ingredients.
Stir constantly for 1 to 2 minutes until the sauce thickens into a glossy glaze that coats the chicken and vegetables.
In a separate small pan, lightly sauté the cauliflower rice for 3 to 4 minutes until warmed through and slightly tender.
Divide the cauliflower rice into a bowl, top with the orange chicken and broccoli stir-fry, and garnish with sliced green onions.