Chicken cobbler recipe

1/2 cup (1 stick) butter 4 cups rotisserie chicken meat, shredded 1 (15 ounce) bag frozen mixed vegetables (such as corn, peas, carrots and beans) 1 (11.36 ounce) package Cheddar bay biscuit mix (such as Red Lobster Cheddar Bay Biscuit Mix®) 2 cups milk 1 (10.5 ounce) can cream of chicken soup 2 cups chicken stock 2 tablespoons fresh chopped parsley (optional)