M&Ms

Ranking: 1
Annual sales: $673.2 million
Who makes it: Mars

Named after its two inventors in 1941, Forrest E. Mars Sr. and R. Bruce Murrie, M&Ms originally were packaged in a tube and came in one variety—plain milk chocolate. Today there are a dozen versions, including M&Ms printed with personalized messages and, of course, peanut, which was added in 1954.