Pat the chicken breast dry with paper towels and cut into 1-inch bite-sized cubes.
In a medium bowl, toss the chicken with arrowroot powder, sea salt, and black pepper until evenly coated.
Whisk together the tamari, rice vinegar, pineapple juice, honey, minced ginger, and minced garlic in a small jar to create the sauce.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken to the skillet in a single layer and sear for 3-4 minutes per side until golden brown and cooked through, then remove chicken and set aside.
Add the bell peppers and broccoli to the same skillet with a splash of water, covering for 2 minutes to steam-soften.
Return the chicken to the pan and pour the sauce over the mixture, tossing constantly for 1-2 minutes until the glaze thickens and coats everything beautifully.
Serve the crispy chicken and vegetables immediately over the warm cooked brown rice.