To install a cooking furnace (stove, oven - whatever you call it) in a garage means you are changing the definition of that space. Putting any safety issues aside for a minute, you would technically be changing your garage into a kitchen. It can be done very safely as long as it's done to code with the same type of ventilation you have in your kitchen. The same sanity requirements would apply, so you'd need to install a sink as well.
As stated below, to make a change like this, you will need to contact the City and I seriously doubt that they will allow you to do this. Cities have very specific rules about converting a garage to any use other than it's intended use. No harm in trying, but I wouldn't hold my breath if I were you.