Add the vinegar, coconut aminos/soy sauce, peppercorn, brown sugar/coconut sugar, bay leaves, half the onions, and garlic to the slow cooker. Mix to combine.
Toss the chicken in the sauce and arrange in an even layer. Top with the remaining onions, close the lid, and cook for 3-4 hours on high or 5-6 hours on low. Remove bay leaves when the chicken is done cooking.
Option 1: Garnish with green onions and dig in.
Option 2: Drain ½ to all of the liquid and reduce by boiling the broth in a saucepan on the skillet for 20 minutes or so. Pour the glaze back over the chicken!