Put potatoes in a large mixing bowl, add cooked bacon, mayonnaise, 1 ¾ cups shredded cheddar cheese, chopped onion, black pepper, salt, garlic, and sour cream. Mix all ingredients together and place in a sprayed 9 x 13 baking dish. Cover with foil and bake in preheated 350 degree oven for 45 minutes.
Remove foil, add the other ¼ cup cheddar cheese, extra bacon and onion if desired and cook another 15 to 20 minutes.
