Cut the chicken breast into bite-sized pieces and pat them thoroughly dry with a paper towel.
In a medium bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and sear for 3-4 minutes per side until golden brown and crispy.
Remove the chicken from the pan and set aside; add the sliced bell peppers and snap peas to the same skillet.
Sauté the vegetables for 2-3 minutes until tender-crisp and slightly charred.
In a small jar, whisk together the pineapple juice, coconut aminos, apple cider vinegar, and honey.
Pour the sauce into the skillet with the vegetables and simmer for 1 minute until it begins to thicken.
Return the crispy chicken to the pan, tossing quickly to coat everything in the glaze.
Serve immediately over the warm cooked brown rice.