Place potatoes in a large pot, covered with salted water and bring to a boil
Reduce heat to medium-low and simmer 15-20 minutes
While potatoes are on the stove, cook bacon over medium heat on the skillet turning occasionally until browned (about 10 minutes) Drain bacon and crumble
Once the potatoes are done, drain and return to pot
Preheat oven to 350° F
Add 1 cup shredded cheddar cheese, evaporated milk, sour cream, salt and pepper into the pot with the potatoes
Mash until creamed and spread potato mixture into baking dish
Bake for 20 minutes
Remove from the oven and top with bacon, green onions and ½ cup cheese
Return to oven and bake an additional 4-6 minutes or until cheese is melted
Notes
You can make additional bacon and add it into the potato mixture