Cut the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Place the chicken in a bowl and toss with cornstarch until each piece is lightly and evenly coated.
In a small jar or bowl, whisk together the coconut aminos, rice vinegar, honey, sesame oil, minced ginger, minced garlic, and red pepper flakes to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet in a single layer and sear until golden brown and cooked through, approximately 6 to 8 minutes.
Add the broccoli florets to the skillet with a tablespoon of water, cover with a lid, and steam for 2 minutes until bright green.
Remove the lid and pour the prepared sauce over the chicken and broccoli.
Stir constantly for 1 to 2 minutes until the sauce thickens into a glossy glaze that coats every piece.