In a large bowl, toss 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. 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 to 9 minutes until golden and fully cooked. Transfer to a clean bowl.
Toss the cooked chicken with the thickening pineapple teriyaki sauce.
Add the remaining avocado oil to the skillet. Sauté the bell peppers and sugar snap peas for 5 to 7 minutes until crisp-tender.
Stir in the pineapple chunks and cook for 1 minute.
Return the chicken and sauce to the skillet. Cook for 2 to 3 minutes until the sauce becomes glossy and coats everything evenly.
Assemble the Teriyaki Chicken Pineapple Bowls by dividing the cooked rice among serving bowls. Top with the chicken, vegetables, and pineapple. Garnish with green onions, sesame seeds, sriracha, and the reserved sauce if desired.