In a large bowl, combine the chicken pieces with salt, pepper, and tapioca starch until evenly coated.
In another bowl, whisk together the honey, pineapple juice, sriracha, tamari, rice vinegar, sesame oil, ginger, and garlic.
Reserve ¼ cup of the sauce for serving, then whisk the tapioca starch into the remaining sauce.
Heat 1 tablespoon avocado oil in a large skillet over medium-high heat.
Add the chicken and cook for 7–9 minutes until golden and fully cooked. Remove from the skillet.
Toss the cooked chicken with the thickened teriyaki sauce until evenly coated.
Add the remaining avocado oil to the skillet.
Sauté the bell peppers and sugar snap peas for 5–7 minutes until crisp-tender.
Add the pineapple chunks and cook for another minute.
Return the chicken to the skillet and cook for 2–3 minutes, allowing the sauce to thicken and coat everything evenly.
Divide the cooked rice among serving bowls.
Top with the Teriyaki Chicken Pineapple Bowls mixture.
Garnish with green onions, sesame seeds, and a drizzle of the reserved sauce if desired.