Cut the chicken breast into bite-sized pieces and pat thoroughly dry with a paper towel.
In a small bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large skillet or wok over medium-high heat.
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, snap peas, and minced ginger to the same pan.
Sauté the vegetables for 3 minutes until tender-crisp, then add the pineapple chunks.
In a small jar, whisk together the coconut aminos, rice vinegar, honey, and minced garlic.
Pour the sauce into the skillet and return the chicken to the pan, tossing everything together for 1-2 minutes until the sauce thickens and glazes the ingredients.
Serve the stir-fry immediately over the warm, cooked brown rice.