Pat the chicken breast dry with a paper towel and cut into 1-inch cubes.
Place the chicken cubes in a bowl and toss with arrowroot starch, sea salt, and black pepper until each piece is lightly and evenly coated.
In a small glass jar or bowl, whisk together the fresh orange juice, coconut aminos, rice vinegar, honey, grated ginger, and minced garlic to create the sauce.
Heat the avocado oil in a large non-stick skillet over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and cook for 5-6 minutes, turning occasionally, until the edges are golden brown and crispy.
Add the broccoli florets to the skillet along with 2 tablespoons of water; cover immediately with a lid and steam for 3 minutes until vibrant green.
Remove the lid and pour the prepared orange sauce over the chicken and broccoli.
Stir constantly for 1-2 minutes as the sauce simmers and thickens into a glossy glaze that coats the ingredients.
Remove from heat and garnish with sesame seeds and thinly sliced green onions before serving.