In a small bowl, whisk together the orange juice, orange zest, tamari, honey, grated ginger, minced garlic, and arrowroot powder until the mixture is smooth and well combined.
Season the diced chicken breast evenly with the sea salt and black pepper.
Heat the sesame oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the skillet and sear for 4-5 minutes, stirring occasionally, until the pieces are golden brown and fully cooked.
Add the broccoli florets, sugar snap peas, and sliced red bell pepper to the skillet, stir-frying for about 3 minutes until the vegetables are bright and crisp-tender.
Pour the prepared orange sauce over the chicken and vegetables, tossing constantly for 1-2 minutes until the glaze thickens and becomes glossy.
In a separate bowl, combine the cauliflower rice and cooked brown rice, then warm them through.
Divide the rice blend into bowls, top with the orange chicken stir-fry, and garnish with freshly sliced green onions before serving.