Brown chicken in olive oil. Remove, set aside, and keep warm. Add onions to pan and saute until limp. Add salt, paprika, garlic powder, cayenne pepper, and peanut butter. Stir in chicken stock, cooked chicken, and parsley and set to simmer on med low heat until sauce thickens slightly (don't let it turn into a lump).
Add a bit more chicken stock if sauce is too thick for your liking.