Cook brown rice according to package instructions or use pre-cooked portions.
In a small bowl, whisk together coconut aminos, rice vinegar, honey, arrowroot powder, minced garlic, and grated ginger to create the sauce.
Cut the chicken breast into 1-inch cubes and season evenly with sea salt and black pepper.
Heat the sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and sear until golden brown and cooked through, approximately 5-7 minutes, then remove and set aside.
In the same skillet, add the diced bell peppers, red onion, and snap peas, sautéing for 3-4 minutes until tender-crisp.
Stir in the fresh pineapple chunks and cook for another minute to warm through and slightly caramelize.
Return the cooked chicken to the skillet and pour the prepared sweet and sour sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze that coats the ingredients.
Serve the stir-fry immediately over the warm brown rice for a complete, clean-eating meal.