Pat the chicken breast dry with paper towels and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, toasted sesame oil, and arrowroot powder until smooth.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken cubes to the skillet and sear until they are golden brown and cooked through, approximately 6 to 8 minutes, then remove the chicken and set aside.
Add the broccoli florets to the same pan with two tablespoons of water; cover with a lid to steam for 2 to 3 minutes until tender-crisp and bright green.
Remove the lid and stir in the minced garlic, grated ginger, and red pepper flakes, cooking for 30 seconds until highly fragrant.
Return the cooked chicken to the pan and pour the prepared sauce over the ingredients.
Toss everything constantly for 1 minute until the sauce thickens into a glossy glaze that coats the chicken and broccoli.
Garnish with sliced green onions and sesame seeds before serving.