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Preheat oven to 325°F Butter a 9x13-inch baking dish.
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Bring a large pot of salted water to a boil. Add potatoes and cook until tender (whole) but still firm, about 15 minutes. Drain, cool, and slice 1/4 inch thick.
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Place chopped bacon in a large, deep skillet. Cook over medium-high heat until lightly brown. Drain, and set aside.
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Combine the potatoes, cheese, onion, mayonnaise, salt, and pepper. Mix well and pour into prepared baking dish.
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Top with bacon and bake in the preheated oven for 1 hour.