Cut the chicken breast into 1-inch cubes and season evenly with sea salt, black pepper, garlic powder, and ground ginger.
In a small mixing bowl, whisk together the coconut aminos, rice vinegar, tomato paste, and raw honey until the sauce is smooth.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken cubes to the skillet and sauté for 6-8 minutes, turning occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
Add the chopped red bell pepper, green bell pepper, and red onion to the same skillet, sautéing for 3-4 minutes until they are tender-crisp.
Stir in the fresh pineapple chunks and the prepared sauce, allowing the mixture to simmer for 2 minutes until it begins to thicken and coat the vegetables.
Return the cooked chicken to the skillet and toss everything together for 1 minute to ensure the chicken is well-coated and heated through.
Serve the sweet and sour chicken immediately over the warm cooked brown rice.