Cut chicken into 1-inch pieces. Heat oil in a saucepan and brown the chicken. Remove and set chicken aside. Saute onions until translucent. Combine 1/2 cup of the water with the peanut butter and mix until smooth. Add to saucepan along with chicken and remaining ingredients. Bring to a boil, then lower heat and simmer for 15 minutes. Garnish with parsley.