Yup, true.

If chickens come from eggs, you'll need an egg first. Its really not that difficult.

Its easy to forget that mammals also grow inside something that resembles an egg, but this simply happens internally. There are exceptions, but a whole lot of life grows inside eggs (with or without hard shell) and as Spike said, it's easily one of the oldest evolutionary developments.

Thus, in an evolutionary sense, the (external) chicken egg really isn't that extraordinary.