It's an original-style Kenner Easy Bake Oven from 1963!
When I was a kid, I LOVED my Easy Bake Oven. I got it for my 8th birthday in 1983. It was the yellow one with brown, pink, and orange trim. It was so much fun!
This one came with the original "cookbook" as well, which I have scanned for your viewing pleasure:
If you'd like to learn more about the history of the Easy Bake Oven, click here for a very thorough article from Collectors Weekly.