In a small bowl, whisk together the fresh orange juice, tamari, honey, grated ginger, minced garlic, and cornstarch to create the orange glaze.
Cut the chicken breast into bite-sized cubes and season 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 cubes to the skillet and cook for 5-7 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same skillet, adding a splash of water if needed to steam, and sauté for 3-4 minutes until tender-crisp.
Return the chicken to the skillet and pour the orange glaze over the chicken and vegetables.
Stir constantly for 1-2 minutes until the sauce thickens and becomes glossy, coating all ingredients.
In a separate pan, lightly sauté or steam the cauliflower rice until tender, then divide onto plates.
Top the cauliflower rice with the orange chicken stir-fry and garnish with sesame seeds before serving.