Dice the chicken breast into bite-sized pieces and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, grated fresh ginger, and arrowroot powder until smooth.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and sauté until golden brown and cooked through, about 5 to 7 minutes, then remove from the pan and set aside.
In the same skillet, add the sliced red bell pepper, snap peas, and minced garlic, cooking for 3 minutes until the vegetables are crisp-tender.
Return the cooked chicken to the pan along with the pineapple chunks and pour the prepared sauce over the mixture.
Toss everything together for 1 to 2 minutes until the sauce thickens into a glossy glaze that coats the chicken and vegetables.
Serve the stir-fry immediately over the warm cooked brown rice for a complete, balanced meal.