Bake potatoes ahead of time and refrigerate. In 3 litre or medium soup pot, brown bacon until crisp, remove with a slotted spoon and set aside. Pour off all fat except 1 tablespoon and add butter. Add onions and saute 5 minutes over medium heat until soft, but not brown. Stir in flour; stir and cook for 1 minute. Add broth, bring to a boil and cook for 2 minutes. Peel and dice potatoes. Add diced potatoes, half-and-half, and sauteed bacon. Simmer for 10-15 minutes. Add cheese and green onions. Stir until cheese is melted.