Dice the chicken breast into 1-inch pieces and toss in a bowl with arrowroot powder, sea salt, and black pepper until evenly coated.
Heat the 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 sear for 3-4 minutes per side until golden brown and crispy.
Remove the chicken from the pan and set aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same skillet with a splash of water to steam-sauté for 3 minutes until tender-crisp.
In a small jar, whisk together the orange juice, coconut aminos, minced fresh ginger, and minced garlic.
Return the chicken to the pan and pour the orange sauce over the mixture, tossing for 1-2 minutes until the glaze thickens and coats everything.
Garnish with sesame seeds and serve immediately while hot.