Dice the chicken breast into bite-sized pieces and toss in a bowl with sea salt, black pepper, and arrowroot powder until evenly coated.
In a small glass jar, whisk together the coconut aminos, pineapple juice, tomato paste, rice vinegar, 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, spreading it out to ensure even browning. Cook for 5-6 minutes, turning occasionally, until the edges are golden and crispy.
Remove the chicken from the pan and set it aside on a plate.
Add the broccoli florets, sliced red bell pepper, and snap peas to the same pan with a tablespoon of water; cover and steam for 2 minutes until tender-crisp.
Pour the prepared sauce over the vegetables and bring to a simmer for 1 minute until it begins to thicken and turn glossy.
Return the crispy chicken to the pan, tossing everything together to coat thoroughly, and serve immediately over steamed cauliflower rice.