peel,and cut potatoes into cubes, and boil until almost soft, at the sametime, cook bacon, until crispy, then cook onion in bacon grease, until soft.
when potatoes are done, drain, and put in a large bowl,add cooked onion, crispy bacon, and mayonaise, mix well. Put in a large casserole dish, cook for 30 min at 350. Sprinkle shredded cheddar cheese ontop! And Serve!