Eat the yeast, CO2 and Bicarbonate of Soda (Rasing agents) have no nutritional value, we may get more out of a nutrient, vitamin rich diet rather than one bulked out with raised bread. If your not descended from Southern Europe/ Middle East, it causes problems with Gluten sensitivity.
Currently I would favour putting the Astronauts into hibernation instead rather than relying on growing food in orbit. At least then later on, later if we send people into space while relying on nutrient recycling, we can put some of them asleep if there is a failure in the hydroponic system. They could survive around 3 months without food, but 2 days without water and no time at all without air. I would rather them get home alive, than to have a nice breadcrust on their space toast.

Without yeast and salt the bread will not be nearly as tasty and nutritious.
Using electricity to generate low heat on a space vehicle is bad engineering. You have all sorts of devices generating waste heat. And a well insulated oven doesn't require as much total energy as a non isolated crock-pot.
Put HEPA filters on all your air intakes will keep the crumbs and the rest of the crud out of the electronics.

L1ma,
You didn't read the article through. They don't want to use raising agents or yeast. And human hibernation is science fiction at this point in time.
Solar irradiation at Mars' orbital distance from the sun is still relatively strong. I don't see why they couldn't use a solar oven on the trip. Solar ovens are already used on Earth, and while solar energy near Mars would be less than half of what's available near Earth, atmospheric attenuation cuts available solar energy at the Earth's surface by half anyway. It evens out. If they have a large Mars expedition spacecraft, a large umbrella-style solar concentrator could give them all the heat they need for cooking while taking up almost no space during launch. Several square meters of aluminized fabric reflector would weigh only ounces.

wonder if it will be anything like space cake.....

Re; Gadgeteer - Of course I read the article. The reason I would not go for baking bread in orbit is because of all the problems Sam Wilkinson is trying to solve, because bread in space is not a problem we have to solve, it is a luxury. However hibernation solves the problem of carrying supplies to Mars quite nicely!.
(http://discovermagazine.com/2007/may/suspended-animation) University of Pittsburgh in 2005 successfully froze and revived 2 dogs. 7 years ago ?, I wonder how well they will do by 2025. Even just a 2 week on off Hibernation cycle would save 50% of supplies needed however I think anyone could only survive being frozen once. The article also mentions on how the research is militarily funded - so we have not heard much of it since.
Most people are more interested in growing hydrophonic plants which you can eat which also recycle urine and create Oxygen. If it was a choice between a solar space oven or solar greenhouse I would grow lettice.

I would have thought this kneaded a little more to it than just mixing in order to stretch the gluten.

L1ma,
It's hardly as simple as you claim. Therapeutic hypothermia can help during cases of trauma, but only for a few hours. Those dogs you reference weren't "frozen" and I don't know where you get "two dogs" from. You can't freeze mammals without massive cellular damage. Some were also suffered brain damage upon revival. As for the Japanese man the article started with, you'll notice there's been no follow-up anywhere on his status. Scientists were skeptical of his doctors' claims that he would recover fully. Some scientists speculated his low body temperature wasn't what saved him, but that his temperature dropped only in the final hours as he was on the brink of death. Besides, he was out for 24 days. If he was eating snow or found some water, that would delay death from dehydration. He has no memory of what he did most of those days. He could have been delirious or maybe just amnesiac. And 24 days is well within the survival period of a person without food so there was nothing extraordinary there. With no food or water at all, a person can survive up to two weeks. Nevertheless, something you fail to appreciate is that all of these reports show mammals with tremendous medical support, something you can't expect on a Mars expedition, and that they were not up and about immediately after being revived, as any astronauts would need to be.

Build it and put it in a supermarket and I will buy one and help iron out the draw backs

Re Gadgeteer;
"Those dogs you reference weren't "frozen" and I don't know where you get "two dogs" from. You can't freeze mammals without massive cellular damage.": I do not have to repeat or justify somone elses reports or articles when they are supported by genuine papers. Please look up University of Pittsburg Safar Center Resuscitation research - I will not revisit this.
This Japanese man is someone in the article I neglected to mention. I also hope like you he is doing well, one of the things about memory loss is that memory is dynamic not static. It is perfectly possible that totally freezing a person solid and rethawing them will erase memory without cellular damage as the mind relys on active electrical means to store memory as much as chemical. Which is why the focus is on Hibernation.
Lots of information on induced hybernation by Asphixiation and poison reducing metabolism to less than 10% with 100% sucessful revival that you forgot to mention from the article.
As to your statement that the subjects received full medical support, that is true. However there is no reason why this should not be available. We already have remote surgery, the Hibernation capsules would contain all the necessary equipment to revive the crew and there should be medical caretaker medical crew available. In fact I would be very disturbed if it was to be absent.

Nice one, Boxpacker! - Doh!