Cook bacon pieces (lardons) over medium high heat in dutch oven until done. Set aside to drain on paper towels. Spoon out any bacon grease in excess of approximately 2 Tablespoons.
Dice bottom ⅓ of green onions and saute' in bacon grease until limp. Set aside.
Add butter and melt over medium heat. Stir in flour. Add milk, whisking for 4-5 more minutes.
Add scooped potatoes and mash with a potato masher or large spoon until most, but not all, of the lumps are mashed out.
Add 1 cup cheese, onion and ½ of the bacon and stir until cheese is melted. The soup can simmer a while at this point or is ready to eat.
Garnish with remaining bacon, additional chopped green onions and additional cheese.
Notes
Number of servings is dependent on how large your servings are and will range from 6 large servings to 12-14 small servings.