Combine hoisin sauce, soy sauce, rice wine vinegar, and Sesame Oil. Whisk to combine.
Heat a Tbl of Avocado Oil (or EVOO) in skillet over medium heat, add ground chicken and cool until no longer pink. Break chicken into small crumbles as you cook. Transfer chicken to a bowl.
Warm the remaining Tbl of Avocado Oil (or EVOO), add mushrooms and cook until tender. Add water chestnuts, garlic and ginger and cook 30 seconds or until aromatic.
Transfer chicken back into pan with vegetables along with half of the green onions.
Pour sauce over top of chicken mixture and stir to coat. Cook until sauce is warmed through, approximately one minute. Drizzle more Sesame Oil over chicken mixture if you like a stronger flavor. Garnish with more green onions.