Pat the chicken breast dry with paper towels and cut into 1-inch cubes.
In a small bowl, whisk together the orange juice, coconut aminos, minced ginger, and minced garlic to create the glaze.
Toss the chicken cubes with arrowroot powder, sea salt, and black pepper until evenly coated.
Heat avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and cook for 5-6 minutes, turning occasionally until golden brown and cooked through.
Remove chicken from the pan and set aside; add the broccoli and bell peppers to the same pan with a splash of water.
Steam-fry the vegetables for 3-4 minutes until tender-crisp.
Return the chicken to the pan and pour the orange glaze over the top.
Stir constantly for 1-2 minutes until the sauce thickens and coats everything in a glossy finish.
Garnish with sesame seeds and serve immediately.