Steam the cauliflower rice in a covered pot or microwave until tender, then set aside.
Whisk orange juice, coconut aminos, ginger, and arrowroot powder in a small bowl until smooth.
Heat olive oil in a large skillet over medium-high heat.
Season diced chicken with salt and pepper, then sauté until golden and fully cooked.
Transfer chicken to a plate; add sesame oil, bell peppers, snap peas, and garlic to the same skillet.
Sauté the vegetables for 3 minutes until tender-crisp.
Return the chicken to the skillet and pour the orange sauce mixture over the top.
Stir constantly for 1 minute until the sauce becomes a thick, glossy glaze, then serve over the cauliflower rice garnished with green onions.