Cut the chicken breast into 1-inch cubes and season evenly with sea salt and black pepper.
In a small bowl, whisk together the orange juice, coconut aminos, minced garlic, grated ginger, and arrowroot powder until the mixture is smooth.
Heat the avocado oil in a large skillet over medium-high heat.
Add the chicken cubes to the skillet and sear for 6-8 minutes, turning occasionally, until they are golden brown and fully cooked.
While the chicken is searing, steam the broccoli florets in a separate pot for 4-5 minutes until they are bright green and tender-crisp.
Pour the orange sauce mixture into the skillet with the chicken and stir constantly for 1-2 minutes until the glaze thickens and coats the meat.
Remove the skillet from the heat, drizzle with sesame oil, and toss once more to combine.
Divide the steamed broccoli into serving bowls, top with the glazed chicken, and garnish with sesame seeds.