In a small bow, whisk together the hoisin sauce, soy sauce, rice wine vinegar, brown sugar, sesame oil, garlic and pepper flakes. Set aside.
For the cashew chicken:
In a medium sized bowl, mix together the chicken and cornstarch. Heat a large skillet over medium high heat and add the vegetable oil. Cook the chicken on all sides until browned about 2-3 minutes. (The goal here is to just brown the chicken, don’t cook it all the way through). Once browned, add the chicken to the slow cooker.
Pour in the sauce, add the onions and bell pepper and mix. Cook on HIGH for 2 hours, after 2 hours add the cashews and green onions, cook on HIGH for another 30 minutes.
Serve over rice, garnish with sliced green onion and enjoy!
Notes
Store leftovers in the refrigerator for up to 3 days in an airtight container.
Boneless, skinless chicken thighs can be used in place of the chicken breast.