1Preheat oven to 350 degrees. Grease a 2 1/2 to 3 quart casserole dish.
2Place potatoes in a large saucepan. Cover with water and bring to a boil. Cook over medium-high heat for 15-20 minutes or until tender and drain.
3Return potatoes to saucepan. Add evaporated milk, sour cream, salt and pepper. Beat with hand-held mixer until smooth. Stir in 1 1/2 cups of cheese and half of the bacon. Spoon mixture into prepared casserole dish.
4Bake for 20-25 minutes or until heated through. Top with remaining 1/2 cup of cheese, remaining bacon and green onions. Bake for an additional 3 minutes or until cheese is melted.