Very simple, I've made a super compact design for a furnace, that automatically cooks what ever you put in the input chest, and it has easy access refueling, with another of the chests.

I've included my earlier designs in the world download, if you wanna have a look at my thought process.

I hope you like it, I don't know whether it's possible to improve on, but if you find a way, please share it =D