Pat the chicken breast dry with paper towels and cut into bite-sized pieces.
In a bowl, toss the chicken with arrowroot starch, sea salt, and black pepper until evenly coated.
Heat avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and sear until golden brown and crispy on all sides, then remove and set aside.
Add the sliced red bell pepper and snap peas to the same pan, sautéing for 3-4 minutes until tender-crisp.
In a small jar, whisk together the pineapple juice, coconut aminos, rice vinegar, minced ginger, and minced garlic.
Return the crispy chicken to the pan with the vegetables and pour the sauce over the top.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze that coats every piece.