Wash, dry and prick potatoes with fork. Bake in 400 degree oven for 1 hour or until done. Let cool. Cut into half length wise and scoop out pulp; set aside. You can throw away the skins or use them for something else.
Melt butter in heavy sauce pan over low heat, add flour, stirring until smooth. Cook 1 minute, stirring constantly.
Gradually add milk, cook over medium heat, stirring constantly until mixture is thickened and bubbly.
Add potato pulp, salt, pepper, 2 teaspoons green onion, half the bacon and 1 cup cheese.
Cook until thoroughly heated. Stir in sour cream. Add extra milk if needed for desired consistency.
Serve with remaining green onions, bacon and cheese.