In a small bowl, whisk together the tamari, honey, minced ginger, minced garlic, and arrowroot powder until smooth to create the teriyaki base.
Cut the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
Heat the toasted sesame oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken to the skillet and sear for 5-6 minutes, stirring occasionally, until golden brown and cooked through.
Add the broccoli florets to the pan with a tablespoon of water; cover with a lid for 2 minutes to lightly steam them until they are vibrant green and tender-crisp.
Remove the lid and pour the teriyaki sauce over the chicken and broccoli.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze that coats every piece.
Transfer to a plate and garnish with sesame seeds before serving hot.