Pat chicken dry, cut into 1-inch cubes, and toss in a bowl with sea salt and arrowroot powder until evenly coated.
In a small jar, whisk together coconut aminos, rice vinegar, honey, minced ginger, minced garlic, and red pepper flakes.
Heat avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add chicken to the hot pan in a single layer, searing until golden brown and cooked through, about 3-4 minutes per side.
Transfer chicken to a plate; add broccoli florets to the same pan with two tablespoons of water, covering with a lid to steam for 3 minutes.
Remove lid, add cauliflower rice, and sauté for 2-3 minutes until the moisture evaporates and the rice is tender.
Return the chicken to the pan and pour the sauce over the mixture, stirring constantly for 1 minute until the glaze is thick and glossy.
Serve immediately, garnished with thinly sliced green onions and toasted sesame seeds for a clean, flavorful meal.