Cut the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Toss the chicken in arrowroot powder until lightly and evenly coated.
In a small bowl, whisk together the coconut aminos, pineapple juice, rice vinegar, tomato paste, and toasted sesame oil.
Heat avocado oil in a large skillet over medium-high heat and sear the chicken until crispy and cooked through.
Remove chicken from the pan, add the bell peppers, broccoli, and snap peas, and sauté until tender-crisp.
Return the chicken to the skillet, pour the sauce over the mixture, and stir for 1-2 minutes until the sauce thickens and glazes the ingredients.
Garnish with sesame seeds before serving.