Baked Potato Soup

This is from my friend Kim. Rich, but tasty!

1/3 C. butter
1/3 C. flour
3 1/2 C. milk
4 medium size potatoes (peeled and cubed)
2 green onions (sliced)
6 bacon strips (cooked and crumbled)
3/4 C. cheddar cheese (shredded)
1/2 C. sour cream

In a large soup kettle, melt butter and stir in flour until smooth. Gradually add the milk, stirring constantly until thickened. Add potatoes and onions. Bring to a boil, stirring constantly. Reduce heat, simmer for 10 minutes. Add remaining ingredients; stir until cheese is melted. Serve immediately.