Pat the chicken dry with paper towels and toss in a bowl with arrowroot powder, salt, and pepper until evenly coated.
In a small bowl, whisk together the fresh orange juice, coconut aminos, minced ginger, and minced garlic.
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 3-4 minutes per side until golden and crispy.
Remove the chicken from the pan and set aside; add the broccoli and bell peppers to the same pan with a tablespoon of water.
Cover and steam the vegetables for 2 minutes until they are bright green and tender-crisp.
Return the chicken to the skillet, pour the orange sauce over the top, and stir constantly for 1 minute until the glaze is thick and glossy.
Garnish with sesame seeds and serve immediately while hot.