Idaho Baked Potato Soup

Well, tonight I'm going to serve fruit soup, of which the recipe is posted here in July 2007, but I was considering making a Potato Soup.

First, my husband made a fun potato soup recipe with our Vita Mix last week. The Recipe is:
(oops, gotta find it again)
Then at my request, my sister-in-law shared how she makes potato soup.
boil cubed potatoes, mash half the potatoes somewhat, add cream, run the other half of the potatoes in food processor, add bacon bits and green onions, salt and pepper.

And finally my Mother wants me to make "Idaho Baked Potato Soup" for her on the recommendation of a long time friend who sent her the recipe on a postcard.

Idaho Baked Potato Soup
2/3 cup butter or margarine
2/3 cup all-purpose flour
7 cups milk
4 large baking potatoes, baked, peeled, and cubed (about 4 cups)
(When I make baked potatoes next, I'll just bake 4 extra ones in the oven and then make this.)
4 green onions, sliced
12 bacon strips, cooked and crumbled (so nice to keep a bag of bacon bits on hand)
1 1/4 cups shredded cheese
1 cup (8 oz.) sour cream
3/4 teaspoon salt
1/2 teaspoon pepper