Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 10 minutes. Drain and set aside to cool.
Mix potatoes, mayonnaise, peas, hard-boiled eggs, bacon, onion, mustard, salt, and black pepper together in a bowl. Refrigerate to allow flavors to blend and bacon to soften, about 1 hour.
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