Cut the chicken breast into bite-sized 1-inch cubes and season evenly with sea salt and black pepper.
In a small glass bowl, whisk together the honey, tamari, sesame oil, minced garlic, grated ginger, and red pepper flakes to create the glaze.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken cubes to the skillet in a single layer and cook for 5-6 minutes, turning occasionally, until golden brown and cooked through.
Add the broccoli florets to the skillet along with two tablespoons of water, immediately covering with a lid to steam for 2-3 minutes until bright green.
Remove the lid and pour the honey-garlic sauce over the chicken and broccoli mixture.
Toss everything continuously for 1-2 minutes over medium heat until the sauce reduces into a thick, glossy glaze that coats every piece.
Transfer the mixture to a large bowl and garnish with sesame seeds before serving hot.