Dice the chicken breast into 1-inch cubes and season evenly with garlic powder, ginger powder, sea salt, and black pepper.
In a small glass bowl, whisk together the tamari, honey, tomato paste, and apple cider vinegar until the glaze is smooth.
Heat the avocado oil in a large stainless steel or cast iron skillet over medium-high heat until shimmering.
Add the seasoned chicken to the skillet and sauté until golden brown and cooked through, approximately 6 to 8 minutes.
Remove the chicken from the pan and set aside, then add the diced bell peppers and red onion to the same skillet.
Cook the vegetables for 3 to 4 minutes until they are tender-crisp, then stir in the pineapple chunks for 1 minute.
Return the chicken to the skillet and pour the prepared sauce over the mixture, tossing constantly until the glaze thickens.
Transfer to a plate and garnish with sesame seeds for a clean, nutrient-dense meal.