In a small bowl, whisk together the orange juice, tamari, honey, minced ginger, and cornstarch until the mixture is smooth.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the olive oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook until golden brown and cooked through, approximately 5 to 6 minutes.
Remove the chicken from the pan and set aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same skillet, adding a splash of water to steam-sauté until they are crisp-tender.
Return the cooked chicken to the pan and pour the prepared orange sauce over the chicken and vegetables.
Stir the mixture constantly for 1 to 2 minutes until the sauce thickens into a glossy glaze that coats every piece.
In a separate small pan, lightly sauté the cauliflower rice for 3 to 4 minutes until it is tender and heated through.
Portion the cauliflower rice into a bowl and top with the orange chicken stir-fry, finishing with a drizzle of toasted sesame oil.