Cut the chicken breast into 1-inch uniform cubes and pat them thoroughly dry with a paper towel.
In a medium-sized bowl, toss the chicken cubes with arrowroot powder, sea salt, and black pepper until each piece is evenly coated.
In a small glass jar or bowl, whisk together the orange juice, coconut aminos, honey, minced fresh ginger, minced garlic, and red pepper flakes to create the glaze.
Heat the sesame oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer, ensuring they aren't crowded, and sear for 3-4 minutes per side until they reach a deep golden brown and crispy texture.
Add the broccoli florets and 2 tablespoons of water to the skillet, then immediately cover with a tight-fitting lid for 2 minutes to steam the broccoli until tender-crisp.
Remove the lid and pour the orange glaze mixture over the chicken and broccoli.
Stir the mixture constantly for 1-2 minutes as the sauce simmers and thickens into a glossy, sticky glaze that coats every piece.