Pat the diced chicken breast dry with a paper towel to ensure maximum crispiness.
In a small bowl, toss the chicken with sea salt, black pepper, and arrowroot powder until evenly coated.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and sear for 3-4 minutes per side until golden brown and cooked through.
Remove the chicken from the pan and set aside; add the sliced bell peppers and snap peas to the same pan, sautéing for 3 minutes until tender-crisp.
In a small jar, whisk together the coconut aminos, rice vinegar, and honey to create the sauce.
Return the chicken to the pan along with the pineapple chunks and pour the sauce over the mixture.
Stir-fry for 1-2 minutes until the sauce thickens into a glossy glaze that coats every piece.
Serve the stir-fry immediately over the cooked white rice and garnish with a sprinkle of sesame seeds.