add chicken, skin side down. let brown, 5 to 6 minutes. remove chicken from pan; set aside. add 1 teaspoon oil to pan, followed by garlic and mushrooms; let brown, stirring occasionally, 5 to 6 minutes. add wine to mushrooms and garlic and bring to a boil, then cook for 1 minute. return chicken to pan. add olives and chicken stock to pan; bring to a boil, then reduce heat. cover; simmer until chicken is cooked through, 15 to 20 minutes. 