In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and arrowroot powder to create the stir-fry sauce.
Season the cubed chicken breast evenly with the 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 to 6 minutes.
Remove the chicken from the pan and set it aside on a plate.
In the same skillet, add the sliced red bell peppers, snap peas, and pineapple chunks, stir-frying for 3 to 4 minutes until the vegetables are tender-crisp.
Stir in the minced garlic and grated ginger, cooking for an additional 30 seconds until fragrant.
Return the chicken to the skillet and pour the prepared sauce over the mixture, stirring constantly for 1 minute until the sauce thickens and coats all ingredients.
Serve the sweet and sour stir-fry immediately over the warm cooked brown rice.