In a small bowl, whisk together the gochujang, tamari, sesame oil, honey, and rice vinegar until smooth.
Season the sliced chicken breast with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and cook for 5-6 minutes until golden brown and cooked through.
Remove the chicken from the pan and set aside.
In the same skillet, add the broccoli, red bell pepper, garlic, and ginger, sautéing for 3-4 minutes until the vegetables are tender-crisp.
Return the chicken to the skillet and pour the gochujang sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens and coats the ingredients evenly.
Garnish with sesame seeds and sliced green onions before serving.