In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and arrowroot starch to create the sweet and sour sauce base.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and cook until golden brown and cooked through, approximately 5 to 7 minutes.
Remove the chicken from the pan and set it aside on a plate.
In the same skillet, add the minced ginger, garlic, bell peppers, and pineapple chunks, sautéing for 3 to 4 minutes until the peppers are tender-crisp.
Return the cooked chicken to the skillet and pour the prepared sauce over the mixture.
Toss all ingredients together for 1 to 2 minutes until the sauce thickens and coats the chicken and vegetables beautifully.
Serve the stir-fry immediately over the warm cooked brown rice.