Slice the chicken breast into thin, even strips and season with sea salt and black pepper.
Thinly slice the red and green bell peppers and the yellow onion into strips.
Mince the garlic and grate the fresh ginger.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan and sear for 4-5 minutes until golden brown and cooked through, then remove and set aside.
In the same pan, add the peppers and onions, sautéing for 3-4 minutes until they are tender-crisp.
Stir in the garlic and ginger, cooking for 30 seconds until fragrant.
Return the chicken to the pan and pour in the coconut aminos.
Toss everything together for 1 minute to glaze the ingredients.
Remove from heat, drizzle with toasted sesame oil, and garnish with sesame seeds before serving.