Pat the chicken breast dry with a paper towel and cut into 1-inch bite-sized cubes.
In a medium bowl, toss the chicken cubes with arrowroot powder, sea salt, and black pepper until evenly coated.
In a small glass jar or bowl, whisk together the orange juice, coconut aminos, honey, minced ginger, and minced garlic to create the glaze.
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 3-4 minutes per side until golden brown and cooked through, then remove chicken from the pan and set aside.
Add the broccoli florets to the same skillet with 2 tablespoons of water; cover with a lid and steam for 3 minutes until tender but still bright green.
Remove the lid, return the chicken to the skillet, and pour the orange glaze over the top.
Stir constantly for 1-2 minutes until the sauce bubbles and thickens into a glossy coating.
Remove from heat, drizzle with sesame oil, and sprinkle with sesame seeds before serving.