Whisk the coconut aminos, rice vinegar, honey, minced ginger, minced garlic, and arrowroot powder in a small bowl until smooth to create the sauce.
Dice the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the skillet and sear for 5 to 6 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set it aside on a plate.
In the same skillet, add the chopped bell peppers and onions, sautéing for 3 to 4 minutes until they are crisp-tender.
Stir in the fresh pineapple chunks and cook for 1 minute to allow them to warm through and slightly caramelize.
Return the cooked chicken to the skillet and pour the prepared sauce over the mixture.
Toss everything together for 1 to 2 minutes until the sauce thickens and creates a glossy coating, then serve over the cooked brown rice.