In a small bowl, whisk together the orange juice, orange zest, coconut aminos, minced ginger, minced garlic, and arrowroot powder until smooth.
Cut the chicken breast into 1-inch bite-sized cubes and season evenly with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok 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 golden brown and cooked through.
Remove the chicken from the pan and set aside; add the broccoli, sliced bell pepper, and snap peas to the same skillet.
Stir-fry the vegetables for 3-4 minutes until they are tender-crisp and bright in color.
Return the chicken to the skillet and pour the orange sauce mixture over the top.
Toss everything together for 1-2 minutes until the sauce bubbles and thickens into a glossy glaze.
Garnish with toasted sesame seeds and sliced green onions before serving.