1. In a large saucepan, whisk flour and milk until smooth. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the potatoes, 1/3 cup cheese, salt & pepper. Cook over medium heat for 2-3 minutes.
2. Remove from heat. Stir in sour cream and 1/4 cup onions. Cover; cook over medium heat for 10-12 minutes (do not boil). Garnish with remaining cheese, onions and bacon if desired.
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