Cut the chicken breast into bite-sized chunks and pat dry with a paper towel.
In a small bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
In a separate small jar, whisk together the coconut aminos, rice vinegar, honey, toasted sesame oil, minced ginger, minced garlic, and red pepper flakes.
Place the broccoli florets in a steamer basket over boiling water and steam for 3-4 minutes until vibrant green and crisp-tender.
Heat the avocado oil in a large non-stick skillet over medium-high heat.
Add the chicken to the skillet in a single layer and sear for 5-6 minutes, turning occasionally, until golden brown and cooked through.
Pour the sauce mixture into the skillet with the chicken and stir constantly for 1 minute as the sauce thickens into a glossy glaze.
Add the steamed broccoli to the pan and toss everything together until the chicken and vegetables are thoroughly coated in the sauce.