Chop the chicken breast into bite-sized pieces and toss them in a bowl with arrowroot starch, sea salt, and black pepper until evenly coated.
In a small glass jar, whisk together the orange juice, coconut aminos, honey, rice vinegar, garlic powder, and ground ginger to create the glaze.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Add the coated chicken to the skillet and sauté until the exterior is golden brown and the meat is cooked through, approximately 6 to 8 minutes.
Add the broccoli florets to the pan with a small splash of water, then cover with a lid for 2 minutes to lightly steam them until they are bright green.
Remove the lid and pour the orange glaze over the chicken and broccoli, stirring constantly for 1 minute as the sauce thickens into a glossy coating.
Transfer the meal to a plate and garnish with sesame seeds before serving warm.