Pat the chicken breast dry and cut into 1-inch bite-sized pieces, then season with sea salt and black pepper.
In a small bowl, whisk together coconut aminos, rice vinegar, honey, sambal oelek, and arrowroot powder to create the sauce.
Heat avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and sear until golden brown and cooked through, about 5-6 minutes.
Remove the chicken from the pan and add the broccoli florets with a splash of water, covering for 2 minutes to steam until bright green.
Stir in the minced garlic and grated ginger, sautéing for 30 seconds until fragrant.
Return the chicken to the pan and pour the sauce over the mixture, tossing constantly until the sauce thickens into a glossy glaze.
Remove from heat, drizzle with toasted sesame oil, and garnish with sliced green onions and sesame seeds.