Cut the chicken breast into 1-inch cubes and season evenly with sea salt, black pepper, garlic powder, and ground ginger.
In a small mixing bowl, whisk together the coconut aminos, rice vinegar, tomato paste, and honey until smooth to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken cubes to the skillet and sear until golden brown and cooked through, approximately 5 to 7 minutes, then remove from the pan and set aside.
In the same skillet, add the sliced bell peppers and sugar snap peas, sautéing for 3 to 4 minutes until they are tender-crisp.
Stir in the fresh pineapple chunks and the prepared sauce, simmering for 2 minutes until the glaze thickens slightly.
Return the cooked chicken to the skillet and toss thoroughly to coat all ingredients in the sweet and sour sauce.
In a separate small pan, lightly sauté the cauliflower rice for 3 to 5 minutes until tender.
Plate the cauliflower rice and top with the chicken stir-fry, finishing with a drizzle of toasted sesame oil and a sprinkle of sesame seeds.