Cut the chicken breast into 1-inch bite-sized cubes and season evenly with sea salt and black pepper.
In a small mixing bowl, whisk together the fresh orange juice, coconut aminos, rice vinegar, arrowroot starch, and grated ginger until smooth.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken cubes to the skillet and cook until golden brown and cooked through, approximately 5 to 7 minutes.
Remove the chicken from the pan and set aside; add the broccoli florets to the same pan with a tablespoon of water.
Cover the pan and steam the broccoli for 2 to 3 minutes until it is bright green and tender-crisp.
Add the minced garlic to the pan and sauté for 30 seconds until fragrant.
Return the cooked chicken to the skillet and pour the orange sauce mixture over the ingredients.
Toss everything together for 1 to 2 minutes until the sauce thickens and coats the chicken and broccoli in a glossy glaze.
Garnish with sesame seeds and serve immediately.