Place potatoes in 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, eggs, bacon, onion, mustard, salt, and pepper together in a bowl. Refrigerate to allow flavors to blend and bacon to soften, about 1 hour.