Preheat oven to 400°F. Brush both side of potato slices with butter; place them on a cookie sheet. Bake for 30 to 40 minutes, or until lightly browned on both sides, turning once. When potatoes are ready, top with crumbled bacon, cheese, green onion. Return to oven and continue baking until the cheese has melted. Add a dollop of sour cream when done and enjoy! Note: You can also poke holes in the potatoes and microwave them for six minutes instead of baking.