Pat the chicken breast dry with a paper towel and cut into 1-inch cubes.
In a medium bowl, toss the chicken with arrowroot powder, garlic powder, sea salt, and black pepper until every piece is evenly coated.
In a small jar or bowl, whisk together the pineapple juice, coconut aminos, apple cider vinegar, and honey to create the sweet and sour sauce base.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken in a single layer and cook for 5-6 minutes, turning occasionally, until the exterior is golden brown and crispy.
Add the sliced bell peppers, red onion, and snap peas to the skillet, stir-frying for 3-4 minutes until the vegetables are tender-crisp.
Pour the prepared sauce over the chicken and vegetables, tossing constantly for about 1 minute until the sauce thickens into a glossy glaze.
Remove from heat and serve immediately while the chicken is at its crispiest.