Whisk the coconut aminos, rice vinegar, honey, sesame oil, arrowroot powder, minced ginger, garlic, and red pepper flakes in a small bowl to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken breast chunks to the skillet and cook for 5-6 minutes until golden brown and cooked through, then remove the chicken and set aside.
In the same skillet, add the broccoli florets and diced red bell pepper, sautéing for 3-4 minutes until they reach a tender-crisp texture.
Return the cooked chicken to the skillet and pour the prepared sauce over the mixture.
Stir constantly for 1-2 minutes until the sauce thickens into a glossy glaze that coats the chicken and vegetables.
Steam the cauliflower rice in a separate pan or microwave until tender.
Portion the cauliflower rice into a bowl and top with the chicken stir-fry, garnishing with sesame seeds and sliced green onions.