In a small bowl, whisk together the orange juice, coconut aminos, grated ginger, minced garlic, orange zest, and arrowroot powder until the mixture is completely smooth.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and sear for 5-6 minutes, turning occasionally, until the exterior is golden brown and the meat is cooked through.
While the chicken is searing, steam the broccoli florets in a steamer basket for 3-4 minutes until they are vibrant green and crisp-tender.
Pour the prepared orange sauce mixture over the chicken in the skillet.
Stir the chicken constantly for 1-2 minutes as the sauce simmers and thickens into a glossy, sticky glaze.
Add the steamed broccoli to the skillet and toss gently to coat every piece in the citrus glaze.
Transfer the mixture to a plate and garnish with sesame seeds and thinly sliced green onions.