Cut the chicken breast into bite-sized 1-inch chunks and place them in a bowl.
Toss the chicken chunks with arrowroot powder until evenly coated.
Steam the broccoli florets for 3-4 minutes until they are bright green and crisp-tender, then set aside.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and red pepper flakes to create the sauce.
Heat the avocado oil in a large skillet over medium-high heat. Add the chicken and cook for 5-6 minutes until golden brown and cooked through.
Lower the heat to medium and add the minced ginger, minced garlic, and toasted sesame oil to the skillet, sautéing for 1 minute until fragrant.
Pour the sauce mixture into the skillet and stir constantly for 1-2 minutes until the sauce thickens into a sticky glaze that coats the chicken.
Fold in the steamed broccoli to warm through and coat with the sauce.
Garnish with sesame seeds and sliced green onions before serving.