Cut the chicken breast into bite-sized 1-inch pieces and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, fresh orange juice, orange zest, minced ginger, and minced garlic to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken pieces to the skillet and cook for 5-6 minutes, stirring occasionally, until they are golden brown and fully cooked through.
Remove the chicken from the skillet and set aside on a plate; add the broccoli florets and sliced red bell pepper to the same pan.
Stir-fry the vegetables for 3-4 minutes until they are tender-crisp and maintain a bright color.
Return the cooked chicken to the skillet and pour the prepared orange-ginger sauce over the chicken and vegetables.
Toss everything together for 1-2 minutes until the sauce coats the ingredients and the aroma is fragrant.
Remove from the heat, drizzle with toasted sesame oil, and garnish with sesame seeds before serving immediately.