Dirty Bird
Pokémon Master
The answer is a matter of perspectiveHate to be a party pooper, but the egg definitely came first. Reptiles had been laying eggs for millions of years, before some of them evolved, grew feathers, and started to fly.
If you believe in evolution - It's the Egg - The chicken evolved from another animals egg
If you believe in creationism - It's the Chicken - God created it.