I need to cook some burritos in the oven, but my oven has had an electrical fault.   I have only a microwave and a gas hob in action. What's going to be the closest alternative to oven conditions? I'm thinking an iron frying pan, partially covered over a low heat. 
You could put a BBQ grill over one of the hobs (raised up if possible), then cook it over the "open fire". Frequent rotation and quite a bit of time may be needed to cook it suitably.  I have a fire pit and a grill when cooking outside over it - normally with God children round.   