To your slow-cooker, add chicken and season with salt, pepper and onion powder.
To a mixing bowl, combine coconut aminos, tamari, sesame oil, rice wine vinegar, tomato paste, honey and starch and mix well - until there are no lumps.
Pour sauce over chicken. Mix to combine. Cook on HIGH for about 2 1/2 hours or LOW for 4 hours, until the chicken is fully cooked and easily pulls apart with a fork.
Shred and mix everything with sauce to make sure chicken is fully coated. Serve and enjoy