Dice the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
Place the chicken in a bowl and toss with arrowroot powder until each piece is lightly and evenly coated.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-6 minutes, turning occasionally, until the edges are golden and crispy.
Remove the chicken from the pan and set it aside on a plate.
In the same skillet, add the sliced bell peppers, minced ginger, and minced garlic, sautéing for 3 minutes until the peppers are tender-crisp.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and tomato paste to create the sauce.
Add the pineapple chunks and the sauce mixture to the skillet, stirring constantly as the sauce begins to bubble and thicken.
Return the crispy chicken to the skillet and toss for 1 minute to glaze every piece before serving hot.