Prep chicken: Season chicken lightly with salt and pepper. Place in slow cooker.
Prepare peanut sauce: In a bowl, whisk together peanut butter, soy sauce, honey, rice vinegar, sesame oil, sriracha (if using), garlic, and ginger until smooth.
Add sauce and vegetables: Pour peanut sauce over chicken. Add bell pepper and carrots.
Cook: Cover and cook on low for 4–5 hours or high for 2–3 hours, until chicken is cooked through and tender.
Add rice: About 30–40 minutes before serving, stir in uncooked rice and chicken broth. Cover and continue cooking until rice is tender and has absorbed flavors.
Shred chicken: Remove chicken, shred with two forks, and stir back into slow cooker.
Serve: Garnish with chopped peanuts, green onions, and fresh cilantro. Serve hot.