In a medium bowl, toss the cubed chicken breast with arrowroot powder, sea salt, and black pepper until evenly coated.
In a small jar, whisk together the coconut aminos, rice vinegar, pineapple juice, minced ginger, and minced garlic to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and cook for 5-6 minutes, turning occasionally, until the exterior is golden and crispy.
Toss in the sliced bell pepper, broccoli florets, and snap peas, stir-frying for 3-4 minutes until the vegetables are tender-crisp and bright.
Pour the sauce over the chicken and vegetables, stirring constantly for 1-2 minutes until the sauce thickens and glazes the stir-fry beautifully.
Serve immediately while hot and the textures are at their peak.