Pat the chicken breast dry with paper towels and season evenly with sea salt and black pepper.
In a small glass bowl, whisk together the honey, coconut aminos, rice vinegar, and tomato paste until smooth.
Heat the avocado oil in a large stainless steel skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and sear for 5-6 minutes until golden brown and cooked through.
Remove the chicken from the pan and set aside on a plate.
Add the bell peppers, snap peas, and pineapple to the same skillet and stir-fry for 3-4 minutes until the vegetables are tender-crisp.
Return the chicken and any accumulated juices to the skillet and pour the prepared sauce over the top.
Toss everything together for 1-2 minutes until the sauce reduces into a thick, glossy glaze that coats every piece.
Garnish with sesame seeds and serve immediately.