Melt butter in skillet and saute chicken which has been cut into 2 inch chunks.
When chicken begins to take on color, add garlic and green onions.
Saute a few minutes being careful not to burn garlic Add remaining ingredients except parsley, cover and simmer over low heat until mixture thickens (you may need to add a little more parmesan cheese if you like it thicker) and chicken is tender and cooked all the way through.
Serve over cooked and drained fettuccine.
Sprinkle with fresh parsley, lots of cracked black pepper and additional parmesan cheese if desired.