Dice the chicken breast into 1-inch cubes and pat thoroughly dry with a paper towel.
Toss the chicken in a bowl with arrowroot powder, sea salt, and black pepper until each piece is evenly coated.
Heat avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan and sear until golden brown and cooked through, approximately 6-8 minutes, then remove chicken and set aside.
In the same pan, add the diced bell peppers and pineapple, sautéing for 3-4 minutes until the peppers are tender-crisp.
Stir in the minced garlic and grated ginger, cooking for another 30 seconds until the aromatics are fragrant.
In a small jar, whisk together the coconut aminos, rice vinegar, and honey until well combined.
Pour the sauce over the vegetables and add the crispy chicken back into the pan.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze that coats every piece.